What Does C Drive (C:) Mean?

The C drive (C:) is the main hard disk partition which contains the operating system and the related system files. In Windows operating systems, the C drive as represented as “C:\”, the backlash representing the root directory of the drive.

Techopedia Explains C Drive (C:)

The letter-naming scheme for disk drives dates back to the early days of DOS. The letters A and B were reserved for the floppy disk drives, whereas C was assigned to main hard disk partition which had the operating system and related system files.