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Markdown Files

Markdown is a plain-text formatting syntax created by John Gruber, standardized as an open specification with no single owner or vendor. Stored directly in a repository as README.md and docs/ files, it's the single most common way developers document a codebase — around #4 among documentation tools at roughly 34.8% usage share. Teams reach for it because it's version-controlled alongside the code, diffs cleanly in pull requests, and renders automatically on GitHub, GitLab, and every code host.

Quick facts
Type: Plain-text formatted documentation stored as files in the repo (README.md, docs/)
Made by: John Gruber (open specification, no single vendor)
Cost: Free / open standard — plain text, no software required
Best for: Any codebase that wants documentation to live and version alongside the code it describes
Primary use case: README files, contribution guides, and docs/ folders that render natively on GitHub/GitLab

Jump to: Example Getting started Best for

Example

A typical README mixes headers, fenced code blocks, tables, and links — all plain text that renders as formatted HTML on GitHub without any build step.

# Project Name

## Installation

```bash
npm install my-project
```

## Options

| Flag       | Default | Description          |
|------------|---------|-----------------------|
| `--verbose`| `false` | Enable debug logging |
| `--port`   | `3000`  | Server port           |

## Contributing

See [CONTRIBUTING.md](./CONTRIBUTING.md) for the full guide.

Getting started

No install needed — create a `.md` file in any text editor, commit it to your repo, and it renders automatically wherever GitHub/GitLab display it.

# create the file
touch README.md

# preview locally with any Markdown-aware editor (VS Code has one built in)
# commit it — GitHub renders README.md on the repo's front page automatically
git add README.md && git commit -m "docs: add README"

Best for: Any project, from a solo script to a large open-source library, that wants documentation to travel with the code in version control rather than living in a separate external tool.