What is IP address

Every computer connected to internet has its unique IP address associated with itself. An IP address acts as an unique identity of a computer at which it can be contacted. If the attacker wants to attack your system he first nedd to know your IP address. All the data send or recive by a particular system is by IP addresses.
It is important for someone to protect his or her IP address while working on the internet because the IP address is like youe mobile numberin the real world.The first job of the attacker is to find out your IP address.

An IP address is a 32 bit long address which is divided into four sub parts.
example: 172.16.254.1
Each 8 bit contain numbers from 1 to 255.