Random Access Memory abbriviation RAM work as a main memory of a computer where the operating system, application programs and data in current use are kept so they can be quickly reached by the device's processor.
The purpose of RAM is to provide quick read and write access to a storage device. Your computer uses RAM to load data because it's much quicker than running that same data directly off of a hard drive. Data remains in RAM as long as the computer is running. When the computer is turned off, RAM loses its data. When the computer is turned on again, the OS and other relevant files are once again loaded into RAM from secondary storage.
There are two types of RAM differ in the technology they use to hold data, with Dynamic Random Access Memory (DRAM) being the more common type. In terms of speed, Static Random Access Memory (SRAM) is faster.
Read-Only Memory or ROM is a storage medium that is used with computers and other electronic devices. As the name indicates, data has been prerecorded on the memory. Once data has been written onto a ROM chip, it cannot be removed and can only be read.
Unlike RAM, ROM retains its contents even when the computer is turned off. ROM is referred to as being nonvolatile, whereas RAM is volatile. Most personal computers contain a small amount of ROM that stores critical programs such as the program that boots the computer.
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