RAM (random-access memory) is a piece of hardware that acts like your computer's short-term memory. The data stored on RAM can be accessed extremely quickly, but is wiped as soon as your computer is switched off.
Temporary data is stored in and retrieved from RAM while you are performing different tasks on your computer. So, the more RAM you have, the more open tasks your computer can handle at once.
Most general-purpose computers come with 2–16GB of RAM, while tablets typically have 1–4GB. If you like to multitask, or use intensive programs like Excel, you will need more RAM. Learn more about the different types of computer memory.