RAM (random access memory) is the place in a
computing device where the operating system (OS), application programs
and data in current use are kept so they can be quickly reached by the
device's processor. RAM is much faster to read from and write to than
other kinds of storage in a computer, such as a hard disk drive (HDD),
solid-state drive (SSD) or optical drive. Data remains in RAM as long as
the computer is running. When the computer is turned off, RAM loses its
data. When the computer is turned on again, the OS and other files are
once again loaded into RAM, usually from an HDD or SSD.
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