PC stands for personal computer.
It is a broad term used to describe any computing device meant for everyday, individual use. Laptops, desktops, tablets, smartphones, and other devices can all considered PCs.
As a technical term, PC refers to any personal computing device, regardless of operating system. This includes devices running macOS.
But PC is sometimes used to describe a brand of product. In this context, PC usually refers to devices running Windows, while the term "Mac" describes Apple devices running macOS.