In most systems, but notably not Linux, there is a separation between the "system" and "applications". Things that are part of the "system" are meant to be a re

In most systems, but notably not Linux, there is a separation between the "system" and "applications". Things that are part of the "system" are meant to be a reliable platform that anything can use. The platform provides UI, networking, crypto, compression, etc. libraries that are used by basically everything and the self-contained application need only supply its various libfoos that aren't part of the platform.