The Internet
We use internet in our day to day life, we use social networking sites, we chat, we shop online, we exchange emails, we do online banking this are some examples of what we do by using internet. We will take a small example we chat using internet, have we ever thought of how many computers we use in this process?? the answer is no. We never think of such silly things, for most of the people the answer for this will be 2 computers i.e. one which is I am using to send a message and the other one is to receive the message. But the answer is no, in between this 2 computers there are dozens of computer bridging together to form a network. So collectively, the collection of this world's linked-up computers together is known as Internet. How they actually do this?? Let's take a closer look at that later.
If I ask some people to define Internet most of them will answer by naming the applications they use over internet for e.g. Google, Flipkart, facebook, and so on. But actually this is not internet, this is World Wide Web. An Internet is the underlying telecommunication network which make use of this application possible.
We can understand internet better if we assume it to be some system, this system consist of two main components the one is Hardware. This component consist of everything from cables which are used for transmission to the computer which we use. Still there are many hardware components in between this such as Routers, Switches, Servers, mobile towers, satellite, radios, smartphones and other connecting devices. All this components together forms a network and combination of this networks is known as Internet. In these networks, some of the components may act as an end points, computers, smartphone and other connecting devices which you use to read this are known as the end points or in other terms they are known as clients. Machines that store the data that we see on web are known as the Servers. Other hardware components are the nodes, which help in connecting the route of a traffic. In between this route it comes the transmission lines, it can be the physical i.e. cables or fiber optics, or it can be wireless i.e. using satellite or radio signals using mobile towers.