I HAVE A LAPTOP WITH A MAXIMUM RAM OF 2GB.
IS IT POSSIBLE TO GET EXTERNAL RAM TO INCREASE IT.
IF IT IS HOW DOES IT WORK.

If you have a USB flash drive, Windows Vista & Windows 7 can use a feature called ReadyBoost to use it as RAM. Simply plug in the drive, go to Computer, right click on the drive and select Properties, and from there allow it to use it for ReadyBoost and select how much of the memory you want it to allocate to ReadyBoost.

OR YOU COULD JUST BUT BIGGER STICKS OF RAM AND REPLACE THE ONES YOU ALREADY HAVE??
READYBOOST IS OVERRATED