The "C Drive" refers to the primary storage location on a computer where the operating system, typically Windows, is installed. It is designated as the "C" drive by default and contains essential system files, program files, and user data. Users can access it through the file explorer to manage files and folders. In addition to the operating system, the C Drive often holds installed applications and user-created documents. It is important to maintain sufficient free space on the C Drive to ensure optimal performance of the computer. Regularly cleaning up unnecessary files can help manage storage effectively.