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Basics of main memory
In essence the main memory is just a large storage area for a bunch of binary digits. Each slot for a 0 or 1 is called a bit:
This is where the running kernal and processes reside - they're just big collections of bits. A CPU is just an operator on memory. It reads its instructions and data from the memory and write back out to the memory. (How Linux Works: Third Edition, Brian Ward 2021)