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RAM stands for Random Access Memory. It is the internal memory that can be read from as well as written to. This memory is often associated with volatile types of memory. It can hold data only on temporary basis because it requires a continuous flow of electrical current.

If current is interrupted, data is lost. It is an integrated circuit that enables you  to access the stored data in a random order constantly.

ROM

ROM stands for Read Only Memory. In ROM , information once stored remain fixed, i.e., it can not be changed. So, ROM can only be read and used. Generally, it contains a set of start-up instructions, i.e., what to do when a computer is turned ON. The content of ROM remain stored even if power is turned OFF.

This memory is often associated with non-volatile types of memory. A ROM cannot be altered once the chip has been made.