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Let's begin our discussion on memory and RAM by defining its meaning and purpose so we can examine how it functions. RAM stands for Random Access Memory, it's allows the CPU to interact with and storage temporary information so it can make logical decisions. From this lesson you'll learn how RAM takes stored information, where it moves it to, and how it interprets it to perform actions. You'll learn the meaning of volatile, what purpose the refresh rate serves, as well as the function and evolution of dynamic RAM. You'll also be able to explain what an SD RAM module does in relation to RAMBUS, what DDR means and an how it differs from DDR2 or 3 if at all.