What is GitHub?

GitHub is the website where most of the world’s open-source code lives. Think of it as Google Docs for programmers — a shared place to store, version, and collaborate on the files that make up a piece of software.

Each project on GitHub lives in something called a repository (or “repo” for short). A repository is just a folder of files with a full edit history attached. Every change anyone has ever made is tracked, with a timestamp and a note about why. You can rewind to any earlier version at any time.

Why GitHub matters even if you don’t code

For non-coders working with AI, GitHub matters because it’s the address you point your AI at when you want it to use a tool somebody else built. A lot of useful AI tooling — community CLIs, plugins, scripts, agents — lives on GitHub as a public repo. You don’t need to read the code. You can hand the link to Claude Code and say, “use this tool to do X for me,” and Claude will read the repo’s instructions, install what it needs, and run the tool on your behalf.

That’s the move that turned natural-language prompting into a way of using any piece of public software, not just the AI itself.

What you’ll see on a GitHub repo

• README. The main instructions file, written by the project’s author. It usually explains what the tool does, how to install it, and how to use it. If you can read English, you can read a README.
• Issues. A list of bugs and feature requests, with discussion. A good place to see what’s actively broken and what’s being worked on.
• Releases. Stable, tagged versions of the tool you can install without worrying about half-finished work.
• Stars. A loose popularity signal — how many people have bookmarked the project.

When you’ll hear about GitHub

• “Clone this repo.” Means “copy the project’s files to your machine.”
• “Open an issue.” Means “report this bug or ask this question on the project’s discussion board.”
• “Pull request.” A proposed change to a project that the maintainer can accept or reject.
• “It’s on my GitHub.” Just means the speaker has uploaded the project to their account — the URL usually looks like github.com/<username>/<project-name>.

Related

• What is Claude Code? — the tool that can read a GitHub repo and use it for you.
• What is a CLI? — many tools you find on GitHub are CLIs.
• What is an API? — APIs are often documented in the GitHub repo of the tool that exposes them.