RAM is used in an array of different devices, making it one of the most common components in existence. It is also among the most versatile of components, being used for everything from storing information written by and accessed by various computer programs to shadowing BIOS on modern computers, a process that speeds up boot times.
RAM is used in personal computers, of course. It is also used in printers, particularly high-end models, as it helps to speed up the printing process by allowing devices to store multiple jobs in their queues. RAM is also used in the most popular new devices on the market. Smartphones, for example, use DRAM and most any sophisticated piece of equipment that allows you to access and store information likely has some type of RAM installed on it.