It is also called main memory. Program data is copied into RAM before the CPU can
run the program. RAM is usually measured in gigabytes. The more gigabytes of RAM
a computer has, the more programs and operations it can handle at the same time.
Read-only memory, or ROM, is a form of data
storage in computers and other electronic devices
that can not be easily altered or reprogrammed.
ROM in non-volatile and the contents are retained
even after the power is switched off.
RAM allows the computer to read data quickly to run
applications. It allows reading and writing.
ROM stores the program required
to initially boot the computer. It
only allows reading.