RAM (First Year)

RAM
Primary memory (RAM) is short-term memory and can be used only while the computer is working. The moment it is switched off the contents of primary memory lost. We also know that the primary or main memory stored data as well as programs. When the computer is doing any job, the data that have to be process are kept in the primary memory. This data may come from an input device like a keyboard or secondary storage device like a disk. It is also known as read / write memory because we can write and red data from the main memory.
ROM
A read only memory (ROM) is one in which information is permanently stored. The information from the memory can only be read and it is not possible to write fresh information into it. This is the reason why it is called ROM. When the power supply is switched off, the information stored inside a ROM is not lost as it is in the case of a RAM chip. Such memories are also known as filed stores, permanent stores or dead stores.