Read-only memory (ROM) is a class of storage media used in computers and other electronic devices. It’s easily cannot be written to, its main use lie in the distribution of software. Some ROMs can be erased and re-programmed multiple times, although they are still referred to as ” read only” because the reprogramming process involves relatively infrequent, complete erasure and reprogramming, not the frequent, bit-or word at a time updating that is possible with RAM.

Random access memory (RAM) is a type of data store used in computers that allows the stored data to be accessed in any order-that is, at random, not just in sequence. Generally RAM in a computer is considered main memory or primary storage; the working area and data. This type of RAM is usually in the form of integrated circuits (ICs). These are commonly called memory sticks or RAM sticks because they are manufactured as small circuit boards with plastic packaging personal computers have slots for adding and replacing memory sticks. Most RAM can be both written to and read from, so “RAM” can both written to and read from, so “RAM” is often used interchangeably with “read-write memory”. In this sense , RAM is he “opposite” of ROM, but in a more true sense, of sequential access.