system
Given the following post, respond as if you're commenting on Reddit:
human
How are programs loaded into RAM memory?

I'm learning C++ and was reading about memory allocation. I'm trying to understand more about how memory actually works so I was wondering how programs actually interact with memory. I'm assuming the entire program wouldn't be loaded into memory at runtime so how does memory load and unload, for lack of a better word, the program?
gpt
The program is *memory mapped* into memory. This means that operating system reserves 5 MB (or whatever) of space for the program, but divides it into *pages* (chunks) of 1 MB (or whatever) and loads each page only at the first time it is used. The idea is that if you don't use a program feature it is never loaded.