Any reasons for using computers in business are listed below:
- To send/receive emails.
- To provide efficient services to the customers.
- To maintain an account of business.
- To promote the business via social media marketing, email campaigns, etc.
- To do business remotely from all over the globe.
- To store data in an organizedway which allows for easy access and use.
- To keep the data and information securely.
- To make a paperless environment.
- To do sales analysis and financial forecasting.
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Any four reasons for using computers in the health sector are listed below:
- To keep the records of patients and medical information.
- To diagnose the diseases of the patients.
- To perform surgical operations.
- To monitor the condition of patients continuously.
- To research the cause of diseases.
- To research new medicines.

Any four reasons for using computers in education sector are listed below:
- To increase the access to education.
- To improve the quality of teaching and learning.
- To improve knowledge sharing.
- To increase the efficiency and effectiveness in admission and classrooms.
- To provide online courses for those who are looking to obtain degrees without quitting their jobs.

A French mathematician, Blaise Pascal, invented the first mechanical calculator ‘Pascaline’ in 1642 AD.

Charles Babbage is considered as the father of computer since the idea used in his analytic engine led to the development of the first electromechanical computer ‘Mark-I’.

Napier's bones was the calculating device invented by John Napier and was based on the principle of logarithm which consisted of 11 sets of rectangular shaped bone rods carved with the logarithm values.

The Abacus is the first calculating device developed by human beings which is made up of a wooden frame having two parts- upper deck and lower deck which contains 11 vertical rods with each rod consisting of movable beads.
Each rod contains two beads in the upper deck (also called Heaven) and five beads in the lower deck (also called Earth).

The limitations of computers are listed below:
- Sinceit is a programmable electronic machine, it cannot work without the programs.
- It performs only those tasks which are instructed by the program.
- It cannot use its own logic and learn anything by performing the tasks.

A computer is called a versatile machine because of its capability of performing a variety of tasks.

A computer is called a diligent machine because of its capability of performing the tasks repeatedly for a long time without losing accuracy and speed.

The difference between GIGO and Bug are listed below:

The features of computer are listed below:
-Speed
-Accuracy
-Diligence
-Versatility
-Storage
-Automatic

A computer is an electronic programmable device which performs mathematical calculations, logical calculations and many other varieties of tasks by accepting data and instructions, processing them according to the program and producing information.