Random Access Memory, or RAM (pronounced ramm), is the physical hardware in a computer that temporarily stores data and functions as the computer's "working memory."
RAM Explained – Random Access Memory
Additional RAM allows a computer to work with more information at once, which typically has a significant effect on overall system performance.
Some popular RAM manufacturers include Kingston, PNY, Crucial, and CORSAIR.
Simply put, the purpose of RAM is to provide fast read and write access to a storage device. Your computer uses RAM to load data because it is much faster than spinning the same data directly from a hard drive.