How to understand computer memory

What is RAM? RAM stands for random access memory, it is used as a temporary store of data so they can be retrieved quickly if needed.

ROM stands for Read Only Memory, it is permanent, non-volatile and contains programs and data needed to start up the computer.

Virtual memory is when a computer is running the operating system and several programs at the same time, the RAM memory becomes full and the operating system will pretend virtual memory to store data