What is swap?
Even if you encrypt data on your partitions, something that is often overlooked is your swap partition. Swap is where linux ‘swaps’ programs (and their stored data) from physical system memory onto the hard disk when they are not used. When those programs become used again, the system ‘swaps’ them back into memory. This approach can allow you to run more programs than you have RAM for, at the cost of delay – for example when programs are swapped back into RAM from disk.

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