I gathered up a few of the common memory terms. I don't know if these are of much help or not, but I am sometimes asked questions what the different RAM abbreviations stand for, so I hope that there is at least one person out there that can benefit from this rather dry information.

Bank normally means a group of memory slots that must have matched modules installed.  For instance you may hear 4 banks of 2. This means there are 4 banks, each requiring 2 matched memory modules.

Cache:
Static random access memory containing recently used information

Compact Flash
This is commonly found in digital cameras, cell phones and audio devices.  The memory chips are in a plastic case and can be inserted removed from the device they are in. For instance the card can be removed from a camera and inserted into the computer to download the photos.

DDR
Stands for Double Data Rate, It is a type of SDRAM. DDR and DDR SDRAM are the same thing.

DDR2
Stands for Double Data Rate, 2nd generation, DDR2 was the upgrade to DDR and offers better performance. It is faster than DDR.

DIMM
Stand for Dual Inline Memory Module. Most often used in Desktops, whereas SODIMM is more often used in laptops.

DRAM
Dynamic Random Access Memory.

Dual Banked
A memory module with two banks or two rows.

Dynamic
Type of RAM (random access memory). To keep data in the DRAM, this data needs to be "refreshed" (recharged). The electric charge fades out of a DRAM like air seeps out of a balloon. Because of this change, it is called "dynamic."

ECC
Error correction code. This memory although slower than Non-ECC is able to correct memory errors and is often used in servers.

EDO
Extended Data Out.

FSB
Front Side Bus.

Flash Card
This is a small  memory module for laptops, audio devices, cameras, cell phones, etc. that has its chips in a plastic case. You can remove the flash card without losing data and transfer it to a computer, or use it as additioanl memory.

Flash Memory
COmpact flash, SmartMedia, PCMCIA, etc. are all Flash memory.They all store memory and can be remove from a device without losing what is stored.

Gigabit, Gigabyte, Gigabite, GB
1024 Megabits

JEDEC
Joint Electron Device Engineering Council. The group that establishes the industry standards for memory operation, features, and such.

Latency or CAS Latency
How long it takes memory to communicate and do what it is supposed to. CL2 or CL3. So it means Cas Latency2 or Cas Latency3. To better understand, CL2 is faster than CL3.

MHz
Megahertz  Speed of clock cycles in millions of cycles per second/

PCMCIA
Personal Computer Memory Card International Association.

Pin
The Edge Contacts on a Memory Module. You will often hear 200-pin or 240-pin.

RAM:
Random Access Memory.

RDRAM:
Rambus Dynamic Random Access Memory.

ROM:
Read Only Memory

RIMMTM
Rambus Inline Memory Modules used for Rambus DRAM.

Registered Memory
Registers delay memory information for one clock cycle to ensure all communication from the chipset is collected by the clock edge, providing a controlled delay on heavily loaded memories.

SDR
SDRAM Single Data Rate Synchronous Dynamic Random Access Memory

SGRAM
Synchronous graphics RAM.

SIM
Single inline module. Same as SIP except with a connector edge instead of leads.

SIMM
Single inline memory module. A high-density DRAM package alternative consisting of several components connected to a single printed circuit board.

SIP
Single inline package. A component or module that has one row of leads along one side.

SLDRAM
Synchronous link dynamic random access memory. SLDRAM is a type of SDRAM that uses a multiplexed command bus allowing fewer pins to increase bandwidth and allow higher FSB speeds.

SODIMM
Small outline dual inline memory module. These are normally what you put in a laptop.

SORIMMTM
Small outline Rambus inline memory module. Smaller than RIMMs these are mostly used for laptop computers.

SRAM:
Static Random Access Memory.An integrated circuit similar to a DRAM (dynamic random access memory) but the memory does not need to be refreshed and SRAM keeps its contents even when the the device is turned off.

Synchronous Memory
Memory that has its signals synchronized with the system clock such as SDRAM and DDR.

Unbuffered memory
Nothing between the chip set and the memory chips on the module as they communicate.

VRAM
Video RAM.