WHAT IS A COMPUTER?

Hard drive

Computer

A computer is a general device that can be programmed to carry out a set of arithmetic or ligical operation automatically

What is and for what is used a hard drive?

A hard drive is a disk used to store digital information. A hard drive can also retrain information when it is powered off. Data is read in a random access maner , meaning that individual blocks of data can be stored
Computer Basics Terminology: What is a Hard Drive, What Is RAM