It is when the active RAM gets temporarily stored on the harddrive. This allows the computer to use the RAM for another task but quickly load up what you were working on earlier.
Imagine you have 16 GB of RAM, and are using a big photoshop image that is using 15GB of ram. You take a break and open up Chrome, which uses 14GB of ram. The computer stores your photoshop file temporarily on the hard drive so Chrome can use the RAM. When you go back to photoshop, it can simply pick up where you left off quickly.
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