API key
A long password that gives a program access to a service, for example to Claude. You pay for what you use. It’s kept secret, like a PIN.
Where you learn it
In module 00 · Installation and first steps, in the Claude Code for Beginners course.
Related terms
Learn Claude Code from zero, in plain English
12 modules with 1–2 minute lessons, which you can also do on your phone. The first two modules are free.