Computer memory is broadly classified into primary and secondary memory. Primary memory includes RAM (Random Access Memory) and cache memory, which temporarily store data for active processes, enabling fast access and smooth performance. Secondary memory includes storage devices like hard drives, SSDs, and optical disks, which provide permanent data storage. There is also ROM (Read-Only Memory), which stores essential startup instructions. While RAM is volatile and loses data when power is off, secondary memory retains information permanently. Memory plays a critical role in computer speed, multitasking capabilities, and overall efficiency of executing tasks and storing data.