There are several things that are usually overlooked, and the reason behind naming the default drive in Windows is one of them.
It would have been anything if it had to be a C because it doesn't follow any order. Logically, the default drive should be A.
so why? Why did Windows do this?
Actually the reason is something historical. This is related to classic floppy drives. Before hard disks became the standard for disk drives (1980), floppy disks were used to boot computers. These floppy disks were available in two sizes at the time: 5 1/4 "and 3 1/2".
These floppy disks were named local disk (A), and the other named local disk (B). After the invention of the hard disk, an 8-inch floppy disk came into being.
Hard disk drive was named C. After that, hard disks became the standard for drives, drive names A and B disappeared as floppy disks disappeared, and C remained the default name for hard drives.
Despite all this, you can rename your default to whatever letter you want (if there is no other drive with the same alphabet as its name) if you have administrative rights