ram?

it'll be ddr, but not dektop sticks, laptop ram has a different pin arrangement.
Tell us the model laptop and we'll tell you the ram required
 
It's DDR2, but you'll have to check if it's 533mhz (PC2-4200) or 400mhz (PC2-3200). They must match if you were to buy another stick. You can try opening it up to see the label on the existing stick or see if there is documentation on the box that lists it.
 
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