Please tell me what is hard disk.
Hard disk is data storage device where you can store your data.
Hard disk is a data storage device and its a part of a computer where you can store your data.
A hard disk drive (HDD), hard disk, hard drive or fixed disk is a data storage device used for storing and retrieving digital information using one or more rigid ("hard") rapidly rotating disks (platters) coated with magnetic material. The platters are paired with magnetic heads arranged on a moving actuator arm, which read and write data to the platter surfaces. Data is accessed in a random-access manner, meaning that individual blocks of data can be stored or retrieved in any order rather than sequentially. An HDD retains its data even when powered off.
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The hard drive of a computer is a device that stores all the software installed on a computer, as well as all the data files created and used by this software.