The term PC Memory can be broken down into two components: ROM (3 letters) and RAM (3 letters). ROM stands for Read-Only Memory, which is a type of non-volatile memory that stores data permanently. It is used to store the computer's basic input/output system (BIOS) and other essential programs. RAM stands for Random Access Memory, which is a type of volatile memory that stores data temporarily. It is used to store data and instructions while the computer is running.