It is a class of storage memory medium used in computers and other electrical devices
ROM is memory that cannot be changed by a program or user.
Ram stands for Random Access Memory
RAM is a fast temporary type of memory in which programs, applications and data are stored.
If a computer loses power, all data stored in its RAM is lost.
In computers, volatile is used to describe memory content that is lost when the power is interrupted
or switched off. Your computer's ordinary memory (or RAM ) is volatile memory.