The history of the computer dates back to several years. There are five prominent generations of computers. Each generation has witnessed several technological advances which change the functionality of the computers.

Characteristics of Computer System involve Speed, Accuracy, Diligence, Versatility, Reliability, Automation, Memory.

Computers play a role in every field of life. They are used in homes, business, educational institutions, research organizations, medical field, government offices, entertainment, etc.

Computer systems consist of three components as shown in below image: Central Processing Unit, Input devices and Output devices.

Input devices help to get input or data from user.

There are few other input devices which help to feed data to the computer.

Output devices help to display output to user

Computer memory refers to storage area where data is stored. It is of two types Primary Memory & Secondary Memory.

The term hardware refers to mechanical device that makes up computer.

Software can be categorized into two types – System software & Application software

The languages that are used to write a program or set of instructions are called “Programming languages”. Programming languages are broadly categorized into three types – Machine level language, Assembly level language, High-level language.

Computer does not understand human language. Any data, viz., letters, symbols, pictures, audio, videos, etc., fed to computer should be converted to machine language first. Computers represent that data into different forms.

Data processing is a process of converting raw facts or data into a meaningful information.

IECT stands for Information Electronics and Communication Technology.