A memory slot, memory socket, or RAM slot is what allows computer memory (RAM) to be inserted into the computer. Depending on the motherboard, there may be 2 to 4 memory slots
(sometimes more on high-end motherboards) and are what determine the
type of RAM used with the computer. The most common types of RAM are SDRAM and DDR for desktop computers and SODIMM for laptop
computers, each having various types and speeds. In the picture below,
is an example of what memory slots may look like inside a desktop
computer. In this picture, there are three open available slots for
three memory sticks.