Your computer's internal memory, known as Random Access Memory (RAM), is faster than a hard disk drive and is used to store your operating system and frequently used programs. Creating temporary files, moving windows around the desktop or using resource hungry applications all require extra memory, otherwise the computer will run slower as time goes on. If it becomes overloaded with demands it may start to slow down and even freeze. Adding extra memory is an affordable way of helping your machine cope with more demanding tasks!