In computing, swap space provides a layer of abstraction between the operating system and the physical memory. When a process needs more memory than is available in physical RAM, the operating system can move some of the data from RAM to swap space. This allows the process to continue without requiring changes to the code. Swap space can also store data that is not currently being used but may be needed in the future. This allows the operating system to reclaim Physical RAM for other uses. Swap space is typically created when the operating system is installed and is a fixed size. On Linux systems, swap space can be increased by adding additional disk partitions or by using a file on a regular file system.
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