Why is Windows OS referred to as "PC"? Are computers running Macintosh and Linux not a "PC"?

Question

I usually come across this in different tutorials. They'll say
'If your on a "PC",
"If you're on a Mac",
"If you're on Linux"'.

Are others not personal computers?

Answer 1

PC stands for "Personal Computer" it's not an os family as compared to mac and linux:) when we say PC we usually mean Windows os.

Answer 2

PC was the name given by IBM for the machines they made for general public. And in collaboration with Microsoft, PC-DOS was written and implemented in those machines. There onwards, the legacy carried on