Definition of Random Access Memory

What do you mean by the Random Access Memory ?

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Random-access memory is a form of computer data storage.

RAM device allows data items to be read and written in roughly the same amount of time regardless of the order in which data items are accessed.

The two main forms of modern RAM are static RAM (SRAM) and dynamic RAM (DRAM).

RAM refers solely to solid-state memory devices (either DRAM or SRAM), and more specifically the main memory in most computers

RAM comes in an easily upgraded form of modules called memory modules

RAM (mostly SRAM) are also integrated in the CPU and other ICs on the motherboard, as well as in hard-drives, CD-ROMs, and several other parts of the computer system.

RAM is used in numerous other ways.
RAM disk
Shadow RAM

So a big application can easily take 100 megabytes of RAM or more

On your machine, at any given time you might have the following applications running:
A spreadsheet
An e-mail program
A word processor
A drawing program
Three or four browser windows