---
title: "What is it? Visual Explainers"
description: "22 visual explainers about What is it?."
---

# What is it? Visual Explainers
> 22 visual explainers about What is it?.

## Visual Explainers

### [Automated Testing Is a Verification Layer, Not a Test Count](https://yomu.fyi/visual-explainers/automated-testing-is-a-verification-layer-not-a-test-count.md)
- Type: What is it?
- Tags: [Automated testing](https://yomu.fyi/topic/automated-testing.md), [Automation](https://yomu.fyi/topic/automation.md), [CI/CD](https://yomu.fyi/topic/ci-cd.md), [Coding Agents](https://yomu.fyi/topic/coding-agents.md), [Evaluation](https://yomu.fyi/topic/evaluation.md), [Testing](https://yomu.fyi/topic/testing.md)

Automated testing is a verification layer with four moving parts: generate, execute, verify, and triage. This explainer maps each part and shows where human judgment still belongs.

### [Car Rental: A Search Layer, a Contract, and a Handover](https://yomu.fyi/visual-explainers/car-rental-a-search-layer-a-contract-and-a-handover.md)
- Type: What is it?
- Tags: [Car Rental](https://yomu.fyi/topic/car-rental.md), [E-commerce](https://yomu.fyi/topic/e-commerce.md), [Logistics](https://yomu.fyi/topic/logistics.md), [Marketplace](https://yomu.fyi/topic/marketplace.md), [Pricing](https://yomu.fyi/topic/pricing.md)

A car rental is a search layer over many fleets plus a contract enforced at the counter. This explainer maps its four parts and why the advertised daily rate never equals the total cost.

### [What an App Store Actually Is: A Contract, a Surface, and a Health Loop](https://yomu.fyi/visual-explainers/what-an-app-store-actually-is-a-contract-a-surface-and-a-health-loop.md)
- Type: What is it?
- Tags: [API Versioning](https://yomu.fyi/topic/api-versioning.md), [App Store](https://yomu.fyi/topic/app-store.md), [Developer Experience](https://yomu.fyi/topic/developer-experience.md), [Developer Platform](https://yomu.fyi/topic/developer-platform.md), [Integration](https://yomu.fyi/topic/integration.md), [Marketplace](https://yomu.fyi/topic/marketplace.md)

An app store is a distribution surface, a versioned contract, and a health loop between a platform and its developers. Here is how those parts fit together and why each one fails loudly if ignored.

### [The GPU-Resident Astronomy Pipeline](https://yomu.fyi/visual-explainers/the-gpu-resident-astronomy-pipeline.md)
- Type: What is it?
- Tags: [Astronomy](https://yomu.fyi/topic/astronomy.md), [CUDA](https://yomu.fyi/topic/cuda.md), [Data Pipelines](https://yomu.fyi/topic/data-pipelines.md), [GPU](https://yomu.fyi/topic/gpu.md), [Image Analysis](https://yomu.fyi/topic/image-analysis.md)

A GPU-resident astronomy pipeline keeps every stage of image analysis — load, align, subtract, detect, review — inside GPU memory instead of round-tripping through the CPU.

### [Arabic Is Not One Target: A Mental Model for Dialect Adaptation](https://yomu.fyi/visual-explainers/arabic-is-not-one-target-a-mental-model-for-dialect-adaptation.md)
- Type: What is it?
- Tags: [Arabic](https://yomu.fyi/topic/arabic.md), [Benchmark](https://yomu.fyi/topic/benchmark.md), [Localization](https://yomu.fyi/topic/localization.md), [Multilingual](https://yomu.fyi/topic/multilingual.md), [Synthetic Data](https://yomu.fyi/topic/synthetic-data.md)

Arabic is not a single target for a language model. This explainer maps its four parts — dialect surface, data pipeline, model, and evaluation — so you can tell where an Arabic feature really succeeds or fails.

### [Bun Is a Toolkit, Not Just a Runtime](https://yomu.fyi/visual-explainers/bun-is-a-toolkit-not-just-a-runtime.md)
- Type: What is it?
- Tags: [Bun](https://yomu.fyi/topic/bun.md), [Deployment](https://yomu.fyi/topic/deployment.md), [Developer Experience](https://yomu.fyi/topic/developer-experience.md), [Node.js](https://yomu.fyi/topic/node-js.md), [Performance](https://yomu.fyi/topic/performance.md), [TypeScript](https://yomu.fyi/topic/typescript.md)

Bun packs a runtime, package manager, bundler, and test runner into one binary. Here is how those four parts fit together and where the seams still show.

### [Agentic Development: The Four Parts of a Delegation Loop](https://yomu.fyi/visual-explainers/agentic-development-the-four-parts-of-a-delegation-loop.md)
- Type: What is it?
- Tags: [Agentic Development](https://yomu.fyi/topic/agentic-development.md), [AI Agents](https://yomu.fyi/topic/ai-agents.md), [Coding Agents](https://yomu.fyi/topic/coding-agents.md), [Evaluation](https://yomu.fyi/topic/evaluation.md), [Human-in-the-Loop](https://yomu.fyi/topic/human-in-the-loop.md), [Sandboxing](https://yomu.fyi/topic/sandboxing.md)

Agentic development turns AI assistance into delegated work: a harness runs the agents, skills supply domain knowledge, a sandbox bounds execution, and evals verify the result.

### [What Is a Real-Time Test Loop?](https://yomu.fyi/visual-explainers/what-is-a-real-time-test-loop.md)
- Type: What is it?
- Tags: [Aerospace](https://yomu.fyi/topic/aerospace.md), [Chaos Engineering](https://yomu.fyi/topic/chaos-engineering.md), [Latency](https://yomu.fyi/topic/latency.md), [Observability](https://yomu.fyi/topic/observability.md), [Predictive Maintenance](https://yomu.fyi/topic/predictive-maintenance.md), [Real-time](https://yomu.fyi/topic/real-time.md)

A real-time test loop is the closed path from sensor acquisition to control action and back to verification. This explainer maps its four parts and the latency budget that binds them.

### [Activation Steering: One Dial, Two Costs](https://yomu.fyi/visual-explainers/activation-steering-one-dial-two-costs.md)
- Type: What is it?
- Tags: [Activation Steering](https://yomu.fyi/topic/activation-steering.md), [Evaluation](https://yomu.fyi/topic/evaluation.md), [Fine-Tuning](https://yomu.fyi/topic/fine-tuning.md), [LLMs](https://yomu.fyi/topic/llm.md), [Prompt Engineering](https://yomu.fyi/topic/prompt-engineering.md)

Activation steering edits a model's internal activations to add or remove a concept at inference time. This explainer maps its one control knob, its two costs, and when it beats prompting.

### [What Is an AI Factory? Power In, Tokens Out](https://yomu.fyi/visual-explainers/what-is-an-ai-factory-power-in-tokens-out.md)
- Type: What is it?
- Tags: [AI Factories](https://yomu.fyi/topic/ai-factories.md), [Data Centers](https://yomu.fyi/topic/data-centers.md), [GPU](https://yomu.fyi/topic/gpu.md), [Inference](https://yomu.fyi/topic/inference.md), [Model Serving](https://yomu.fyi/topic/model-serving.md), [Performance](https://yomu.fyi/topic/performance.md)

An AI factory is a fixed power and cooling budget converted into model output. This explainer maps its four parts and the throughput-per-watt trade-offs that connect them.

### [Bloom Filters: The Cheap Gate Before the Expensive Question](https://yomu.fyi/visual-explainers/bloom-filters-the-cheap-gate-before-the-expensive-question.md)
- Type: What is it?
- Tags: [Bloom Filters](https://yomu.fyi/topic/bloom-filters.md), [Caching](https://yomu.fyi/topic/caching.md), [Distributed Systems](https://yomu.fyi/topic/distributed-systems.md), [Performance](https://yomu.fyi/topic/performance.md), [Search](https://yomu.fyi/topic/search.md)

A Bloom filter is a small bit array plus a few hash functions that answers "has this been seen?" with no false negatives and a false-positive rate you choose up front.

### [Argo CD: The Reconciliation Loop Between Git and Your Cluster](https://yomu.fyi/visual-explainers/argo-cd-the-reconciliation-loop-between-git-and-your-cluster.md)
- Type: What is it?
- Tags: [Architecture](https://yomu.fyi/topic/architecture.md), [Argo CD](https://yomu.fyi/topic/argocd.md), [Deployment](https://yomu.fyi/topic/deployment.md), [GitOps](https://yomu.fyi/topic/gitops.md), [Kubernetes](https://yomu.fyi/topic/kubernetes.md), [OpenShift](https://yomu.fyi/topic/openshift.md)

Argo CD is a GitOps controller that treats Git as the desired state and continuously reconciles it against what actually runs in each cluster. It maps the parts of that loop and why pull-based agents change its scale.

### [BIMI: The Identity Proof Behind the Logo](https://yomu.fyi/visual-explainers/bimi-the-identity-proof-behind-the-logo.md)
- Type: What is it?
- Tags: [BIMI](https://yomu.fyi/topic/bimi.md), [Deliverability](https://yomu.fyi/topic/deliverability.md), [Digital Identity](https://yomu.fyi/topic/digital-identity.md), [DMARC](https://yomu.fyi/topic/dmarc.md), [DNS](https://yomu.fyi/topic/dns.md), [Email](https://yomu.fyi/topic/email.md)

BIMI is a DNS-published claim that ties a verified brand logo to an authenticated domain, so mailbox providers can display it. Here is what each part of that claim requires.

### [Agent Memory: What Outlives the Run](https://yomu.fyi/visual-explainers/agent-memory-what-outlives-the-run.md)
- Type: What is it?
- Tags: [Agent Memory](https://yomu.fyi/topic/agent-memory.md), [AI Agents](https://yomu.fyi/topic/ai-agents.md), [Databases](https://yomu.fyi/topic/databases.md), [LLMs](https://yomu.fyi/topic/llm.md), [Postgres](https://yomu.fyi/topic/postgres.md), [Retrieval-Augmented Generation](https://yomu.fyi/topic/retrieval-augmented-generation.md)

Agent memory is the knowledge that survives a run, not the working state inside one. This explainer separates the two, then maps the write path, the read path, and the database limits that cap recall.

### [Anomaly Detection: From Baseline to Action](https://yomu.fyi/visual-explainers/anomaly-detection-from-baseline-to-action.md)
- Type: What is it?
- Tags: [Analytics](https://yomu.fyi/topic/analytics.md), [Anomaly Detection](https://yomu.fyi/topic/anomaly-detection.md), [Monitoring](https://yomu.fyi/topic/monitoring.md), [Observability](https://yomu.fyi/topic/observability.md), [Time Series](https://yomu.fyi/topic/time-series.md)

Anomaly detection identifies meaningful departures from expected behavior. This explainer shows how signals, baselines, context, and alert routing turn unusual measurements into engineer-ready findings.

### [ABAC: When Data Context Becomes the Access Rule](https://yomu.fyi/visual-explainers/abac-when-data-context-becomes-the-access-rule.md)
- Type: What is it?
- Tags: [Attribute-Based Access Control](https://yomu.fyi/topic/attribute-based-access-control.md), [Auditability](https://yomu.fyi/topic/auditability.md), [Data Classification](https://yomu.fyi/topic/data-classification.md), [Data Governance](https://yomu.fyi/topic/data-governance.md)

Attribute-Based Access Control uses identity and data attributes to decide access. This explainer shows how governed tags become row filters or column masks across data engines.

### [AssemblyScript: the TypeScript-shaped path into WebAssembly](https://yomu.fyi/visual-explainers/assemblyscript-the-typescript-shaped-path-into-webassembly.md)
- Type: What is it?
- Tags: [AssemblyScript](https://yomu.fyi/topic/assemblyscript.md), [Performance](https://yomu.fyi/topic/performance.md), [Sandboxing](https://yomu.fyi/topic/sandboxing.md), [TypeScript](https://yomu.fyi/topic/typescript.md), [WebAssembly](https://yomu.fyi/topic/webassembly.md)

AssemblyScript is a TypeScript-like way to target WebAssembly. This explainer shows how source becomes a sandboxed module, crosses explicit host boundaries, and fits performance-sensitive services.

### [Apple Integration Is a Boundary, Not a Feature](https://yomu.fyi/visual-explainers/apple-integration-is-a-boundary-not-a-feature.md)
- Type: What is it?
- Tags: [Apple](https://yomu.fyi/topic/apple.md), [Architecture](https://yomu.fyi/topic/architecture.md), [Authentication](https://yomu.fyi/topic/authentication.md), [iOS](https://yomu.fyi/topic/ios.md)

Apple integrations are boundary designs: native capability, server-side mapping, and trust checks must meet a platform-agnostic product layer. See where each responsibility belongs.

### [Anycast: One IP, Many Locations](https://yomu.fyi/visual-explainers/anycast-one-ip-many-locations.md)
- Type: What is it?
- Tags: [Anycast](https://yomu.fyi/topic/anycast.md), [Architecture](https://yomu.fyi/topic/architecture.md), [BGP](https://yomu.fyi/topic/bgp.md), [DNS](https://yomu.fyi/topic/dns.md), [High Availability](https://yomu.fyi/topic/high-availability.md)

Anycast announces a single IP address from multiple geographic locations so routers automatically direct users to the nearest server, improving latency and resilience without client changes.

### [What is Accessibility?](https://yomu.fyi/visual-explainers/what-is-accessibility.md)
- Type: What is it?
- Tags: [Accessibility](https://yomu.fyi/topic/accessibility.md)

Accessibility means designing digital products so everyone can use them, regardless of ability. It removes barriers for people with disabilities and benefits all users.

[Older explainers](https://yomu.fyi/visual-explainers/category/what-is-it/page/2.md)