Setup and deactivate swapping on Raspberry Pi

Swapping is the offloading of non-used or seldom used parts of the main memory to a separate memory area on a hard disk. Either in a separate partition or in a file. Both are the swap memory. Under Windows, the swap memory is also known as paging file. The main difference is that the swap file in Windows can in principle grow arbitrarily, while the swap memory, whether as a partition or file, has a static size.