When people hear about the word computer they think of a laptop and desktop computer but computers come in many different types. When you withdraw money using an atm and send mail using a tablet/iPad you're using different types of computers.
DESKTOP COMPUTER: -
Desktop computers work at home, at school, and in the office. Desktop computers are designed to be placed on a desk, and the desktop computer is made up of a few different parts, including the computer case, monitor, keyboard, and mouse. You can use desktop computers only in a single place if you want to move your computer so you can't easily move your computer.
A small laptop computer that is easy to carry in a backpack and laptop computer runs on batteries. This small computer already includes things like a mouse, keyboard, and speaker. If you want to move your laptop computer you can easily move your laptop computer.
TABLET/ TABLET COMPUTER: -
Tablet computers are handheld computers even more portable than laptops. Instead of a keyboard and mouse, tablets use a touch-sensitive screen for typing and navigation. Example of Tablet iPad.
SERVERS COMPUTER: -
A server is a computer that provides a service to another computer on a network. For example, whenever you use the internet, you are looking at websites, videos, and images that are already stored on a server.