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YAML (YAML Ain’t Markup Language)

A human-friendly data serialization format that uses indentation instead of brackets. Used heavily in config files — GitHub Actions workflows, Docker Compose, Kubernetes manifests, many CI/CD pipelines.

name: deploy
on:
  push:
    branches: [main]
jobs:
  build:
    runs-on: ubuntu-latest

Gotcha: YAML is indentation-sensitive. Tabs vs spaces, missing colons, or unquoted strings starting with yes/no/true can produce subtle errors.

See also: JSON, CD

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Yarn

An alternative npm-compatible package manager. Originally faster than npm; npm has since caught up. pnpm is now the popular fast alternative. Yarn is still widely used in older projects.

See also: npm

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