Free public beta until December 4, 2026: every course is open, no card needed. After that, the first chapter of each course stays free and full access is a one-time $39 ($19 for up to 100 founding members chosen for helpful feedback). Your progress is kept. How the beta works

processor

The chip that carries out a program's instructions, one after another; also called the CPU.

A processor (central processing unit, CPU) is the hardware that fetches machine-code instructions from memory and executes them.