A computer is a system made up of two major components: HARDWARE and SOFTWARE. The hardware is the physical equipment and the software is the collection of programs (instructions) that allow hardware to do its job. Below figure represents a Computer system.
The hardware components consists of five parts they are: input devices, Central Processing Unit (CPU), Primary Storage , Secondary storage and auxiliary storage devices.
The Software is divided into two broad categories: System software and application software. System software manages the resources. whereas, Application software is directly responsible for helping the users to solve their problems.
For additional information refer Hardware and Software.