Linux is an operating system kernel. GNU/Linux is the leading operating system on servers.
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Android is a mobile operating system based on a modified version of the Linux kernel.
Free and open-source software (FOSS) is software
that is available under a license that grants the right to use,
modify, and distribute the software, modified or not, to everyone free of charge.
The public availability of the source code is, therefore, a necessary but not sufficient condition.
FOSS is an inclusive umbrella term for free software and open-source software.
FOSS is in contrast to proprietary software, where the software is under restrictive copyright
or licensing and the source code is hidden from the users.
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