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

memory

The computer's working storage, where running programs and their data live; also called RAM.

Main memory (RAM) is byte-addressable storage that holds the code and data of running programs.