The short answer
Claude Code is an agentic coding tool from Anthropic. It works inside your actual project: it reads your files, edits code, runs commands like your test suite, and checks its own work. You talk to it in plain English, and it does the multi-step work a developer would do, with your permission at each step that matters.
Why "agentic" matters
A chatbot answers questions. An agent takes actions toward a goal, looks at the results and decides what to do next. Ask Claude Code to fix a failing test and it will run the test, read the error, find the code, make a fix and run the test again, all without you copying anything back and forth.
That loop (act, observe, decide) is the whole difference. It's why developers describe Claude Code less like a tool and more like a capable teammate.
What can it do?
- Understand codebases: "give me an overview of this repo" or "how does auth work here?"
- Fix bugs: from a stack trace, a failing test or a bug report
- Build features: plan the change, implement it in steps, test it
- Refactor and migrate: across dozens or hundreds of files
- Review code: find correctness and security problems before merge
- Handle git: write commit messages, open pull requests, resolve conflicts
- Automate: run in scripts, CI pipelines and on schedules
Where does it run?
The original is a command-line tool: you type claude in a project folder. The same engine also runs in VS Code and JetBrains, a desktop app, on the web and mobile (in the cloud against your GitHub repos), and in GitHub Actions and other CI systems.
What do you need?
A Claude subscription (Pro, Max, Team or Enterprise) or an Anthropic Console account, a computer running macOS, Linux or Windows, and basic comfort with a terminal. Installation is one line. Lesson 3 of our course walks you through it.
How to learn it properly
Most people pick up the basics in an afternoon and then plateau. The difference between "it's okay" and "it's transformative" comes from a handful of habits:
- Explore, plan, then code. Use plan mode for anything non-trivial.
- Give Claude a check to run, like tests or a build, so it can verify its own work.
- Manage context with
/context,/compactand/clear. - Write a lean CLAUDE.md so Claude remembers your project's conventions.
- Enforce what matters with hooks, not just instructions.
Those habits are the backbone of Claude Code Academy's curriculum. The first three lessons are free, so you can start right now.