What does SODIMM stand for?
SODIMM stands for small outline dual inline memory module. These small modules are used primarily in laptops and Apple iMac systems.
An SODIMM consists of a number of memory components (usually black) that are attached to a printed circuit board (usually green). SODIMMs get their name because they are smaller and thinner than regular DIMMs. The gold or tin pins on the bottom of the SODIMM provide a connection between the module and a socket on a larger printed circuit board.
A typical 200-pin SODIMM is pictured below: