Short for Random Access Memory, RAM, also known as main memory or system memory, is a term commonly used to describe the memory within a computer. Unlike ROM, RAM is a volatile memory and requires power; if power is lost, all data is also lost. Below is an example image of a 512MB DIMM memory stick.
Computer DIMM or dual-inline memory module
Over the evolution of computers their has been several different variations of RAM used in computer. Some of the more common examples are DIMM, RIMM, SIMM, SO-DIMM, and SOO-RIMM.

Reference: http://www.computerhope.com/jargon/r/ram.htm

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