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In computing, memory refers to the computer hardware devices used to store information for immediate use in a computer; it is synonymous with the term "primary storage".

Computer memory types

VOLATILE

RAM
DRAM (e.g., DDR SDRAM) SRAM

In development
T-RAM
Z-RAM

Historical
Williams–Kilburn tube (1946–47)
Delay line memory (1947)
Selectron tube (1953)
Dekatron

NON-VOLATILE

ROM
Mask ROM
PROM
EPROM
EEPROM

NVRAM
Flash memory
Solid-state storage

Early stage NVRAM
nvSRAM
FeRAM
MRAM
PRAM

Mechanical
Magnetic tape
Hard disk drive
Optical disc drive

In development
3D XPoint
CBRAM
SONOS
RRAM
Racetrack memory
NRAM
Millipede memory
FJG RAM

Historical

Paper data storage (1725)
Drum memory (1932)
Magnetic-core memory (1949)
Plated wire memory (1957)
Core rope memory (1960s)
Thin-film memory (1962)
Twistor memory (~1968)
Bubble memory (~1970)