Computer memory - Wikipedia

Computer memory stores information, such as data and programs, for immediate use in the computer.[2] The term memory is often synonymous with the terms RAM, main memory, or primary storage. Archaic synonyms for main memory include core (for magnetic core memory) and store.[3] Main memory operates at a high speed compared to mass storage which is slower but less expensive per bit and higher in capa

[mooz]

揮発性メモリには DRAM, SRAM の他に T-RAM, Z-RAM, TTRAM などがあるとか．