What is RAM
Your computer is able to operate quickly by saving the most used information at a given moment into a place that allows it to be retrieved promptly. That is when the RAM (Random Access Memory) comes into play.
Memory sticks are made for performance and agility, but not for storage capacity. That is the reason why a computer with a low amount of RAM can sometimes perform poorly, as the amount of information available for prompt processing is limited.
RAM is different from hard-drives or a removable storage devices (IE: Disk and Flash Cards). The circuits of a memory stick are designed for optimum performance and speed by being “live", which means electrically charged. However, hard-drives and other storage devices save information permanently by means of magnetism and optical media.
The information saved into RAM is temporary. When an electrical charge is lost so is the memory stored. Because of its limited storage capacity, the older information is replaced by the most immediately requested and when the computer is shut down or restarted, all the information ceases existing.
RAM is also known as Primary Storage for being the only source of information directly accessible by the CPU.