Here are some basic terms related to Internet. If you want to be a Hacker or protect yourself from Hacker, then surely you should go through it.
It is a group of two or more computer systems which are linked together.
It is a system of globally interconnected networks. It is a network of networks.
It is a method to exchange digital information from one person to other. It works on SMTP and POP protocol. SMTP stands for Simple Mail Transfer Protocol while POP stands for Post Office Protocol.
4. lP Address:-
It stands for Internet Protocol Address. It is basically a computer's identity on the Internet. A typical IP address looks like 127.0.0.1