A Digital computer can be considered as a digital system that performs various computational tasks.
The first electronic digital computer was developed in the late 1940s and was used primarily for numerical computations.
By convention, the digital computers use the binary number system, which has two digits: 0 and 1. A binary digit is called a bit.
A computer system is subdivided into two functional entities: Hardware and Software.
The hardware consists of all the electronic components and electromechanical devices that comprise the physical entity of the device.
The software of the computer consists of the instructions and data that the computer manipulates to perform various data-processing tasks.