Ram is random access memory and this is an internal component that in some laptops can be upgraded. Laptops use SODIMM (small outline dual in-line memory module) which is different than desktop RAM and more expensive. It is noticeably smaller than desktop RAM and is normally 2" x 1" with 144 pins. RAM can be specific to laptop manufacturers and models. You can't mix types of RAM with your laptop. Some laptops require that you install RAM in matched pairs. For a system that has 512MB of RAM, that is composed of two sticks of 256MB RAM 2 GB is the minimum you should get. When purchasing your laptop have the RAM upgraded before you purchase.
