Difference between RAM and ROM

There are several major differences between a ROM (read-only memory) chip and a RAM(random-access memory) chip.

RAM

RAM chips are used in computers and other devices to store temporary information produced by programs quickly. RAM is one of the fastest types of memory, allowing it to switch quickly between tasks. For example, the Internet browser you are using to read this page is loaded into RAM and is running from it.

ROM

A good example of ROM is the computer BIOS, which is a PROM chip that stores the programming needed to begin the initial computer startup process. Using a non-volatile storage medium is the only way to begin this process for computers and other devices. ROM chips were also used in gaming system cartridges, like the original Nintendo, Gameboy, Sega Genesis, and others.

Table of differences

Topic	ROM	RAM
Storage capabilities	ROM is non-volatile, not requiring power to store data.	RAM is volatile, requiring power to store data.
Uses	ROM is often used to store the BIOS program on a computer motherboard. ROM was used as the storage media in a Nintendo, Gameboy, and Sega Genesis game cartridge.	RAM is used in computers to temporarily store files in use on the computer.
Storage capacity	ROM chips often have a storage capacity of 4 to 8 MB.	RAM chips often range in storage capacity from 1 to 256 GB.
Physical size	ROM can vary in size from less than an inch in length to multiple inches in length and width, depending on their use.	RAM is available in two primary sizes, whether used in a desktop computer or a laptop. Desktop RAM is about 5 ½ inches in length and 1 inch in width. Laptop RAM is about half the length of desktop RAM.