Different Operating Systems

  Operating System or OS -- is  software,consisting of programs and data, that  runs on computers, manages computer  hardware resources, and provides common  services for execution of various application  software. The operating system is the most  important type of system software in a  computer system. Without an operating system,  a user cannot run an application  program on their computer, unless the  application program is self booting.

 

Different types of Computers

Based on the operational principle of computers, they are categorized as analog computers and hybrid computers .Analog Computers: These are almost extinct    today. These are different from a digital computer because an analog computer can perform several mathematical operations

My computer skills

Computers work through an interaction of hardware and software. Hardware refers to the parts of a computer that you can see and touch, including the case and everything inside it. The most important piece of hardware is a tiny rectangular chip inside your computer called the central processing unit (CPU), or microprocessor. It's the "brain" of 

The Computer Mouse

The computer mouse is a tool designed to help you use your computer. The majority of mice look similar to the image below but they are also available as tracker balls or joysticks. Some people prefer to use the keyboard instead.
The computer mouse is rolled across a flat surface. This moves a pointer or text cursor around the screen. Mouse functions include click, double click and drag.