RAM or Random Access Memory is an integrated circuit consisting of transistors and capacitors. Memory was once soldered onto the motherboard, but as the need for memory has increased, RAM has been placed on printed circuit boards that can be inserted into slots on the motherboard.
Dynamic random access memory
Static random access memory
Extended data-out dynamic random access memory
Synchronous dynamic random access memory
Double data rate synchronous dynamic RAM
Rambus dynamic random access memory
How to Install RAM
Be sure to have an antistatic wrist strap or discharge static electricity before touching sensitive components.
Unless your system is using SIMMS, an older form of memory, you are probably using DIMMS. This form of memory is installed simply by pressing the memory straight down into the slot. Just make sure the notches are lined-up.
The locks on the end should snap closed if the stick is inserted properly.
Once completed close everything up and plug in the computer. If enabled in BIOS, you should see the correct amount of memory countdown. If the memory doesn't show up, or if you get a series of beeps (usually three short beeps--depending on your BIOS), your memory is probably not seated correctly.