• RAM is volatile memory, which means that when you restart or shut down your computer, the information temporarily held in the module is deleted. Because the data is stored electrically on transistors, it vanishes when there is no electric current. When you request a file or piece of information, it is either fetched from the computer's hard drive or from the internet.
• Non-volatile memory (ROM) is information that is permanently stored on a chip. The memory does not rely on an electric current to save data; instead, binary code is used to write data to individual cells. Non-volatile memory is used for elements of the computer that do not change, such as the software's initial boot-up phase or the firmware instructions that allow your printer to function.

Read More: Why is my iPhone SE unable to connect to iTunes Store, iBooks Store, or App Store, getting error 1202?