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Memory is a high-speed internal storage device.
Without memory, the CPU would have to pull information from the hard drive which operates at a much slower speed than memory. All RAM is either static or dynamic. DRAM is the type used in your computer's main memory. Your hard drive or disk is where you store programs and files that are not currently in use, whereas RAM stores programs and files that are currently in use. Data in DRAM is stored as a series of electronic signals.