Computer memory is the physical device which is used to store data or information on a temporary or permanent basis. In computer field, the term computer memory refers to RAM i.e. the main memory. There are other memory devices too which includes external memory (e.g. pen drive). Computer memory is the physical device which is used to store data or information on a temporary or permanent basis. In computer field, the term computer memory refers to RAM i.e. the main memory. There are other memory devices too which includes external memory (e.g. pen drive).