RAM is short for Random Access Memory, and is also known as internal memory. The computer's operating system uses this memory to store the programs that you're currently running. This allows you to quickly access data and ensures your computer operates smoothly. By expanding the amount of RAM, you can help make your computer faster. When purchasing RAM, keep in mind that you select the right type of internal memory for your desktop, laptop, or Mac. The clock speeds must match the speeds of your motherboard, otherwise the RAM won't properly work.