In case you are wanting the history. IBM actually coined the term PC with their IBM Personal Computers
At the time most computing platforms were incompatible. Software written for a commodore computer wouldn’t work with an apple computer wouldn’t work with an IBM PC.
The IBM PC was popular enough though that people started building “pc compatible” machines. A very popular configuration for this was intel chips with Microsoft DOS. While these machines started out as “pc compatible” after a while the IBM PC wasn’t a big deal anymore so saying “we are compatible with a machine released in 1981” just slowly morphed into “it’s a PC” as shorthand for “intel chipset with Microsoft OS”
Now why didn’t apple get the pc moniker? At the time when the IBM PC launched apple was actively building and selling their own computers and weren’t interested in making them IBM PC clones so they never went out and marketed themselves as “pc compatible” because for the most part they were not.
Thanks for attending my Ted talk
Don’t worry, he seems hard at work making sure all that Tesla stock he got will also be worth less everyday.