When upgrading computer memory which type of memory is commonly used?

That is completely dependant upon your particular motherboard. The older motherboards take different RAM than the newer ones. The way to check is to look at the existing RAM in your system.Be sure to unplug the computer from the wall first.

Then gently wiggle the RAM out of it's socket. There may be a small retaining bracket on each side of the RAM stick; you need to undo that bracket first. Read what is written on the RAM stick.

It may say something like "PC3200", or "PC2-5300", or any one of several other things. Once you know this, you can then buy the right RAM.

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