, also known as RAM, is the type of memory that the computer uses to store data that is currently being used or processed by the CPU. This memory is volatile, meaning that it is cleared when the computer is turned off. On the other hand, , such as a or solid-state drive (), is non-volatile memory that is used to store data permanently on a computer. The hard drive is a common type of secondary memory that uses magnetic storage to store large amounts of data, while an SSD uses flash memory to provide faster access to data compared to a traditional hard drive. Both types of secondary memory work in conjunction with primary memory to provide a complete storage solution for a computer system.