IP address is nothing but the physical address of your computer. If two pc want to connect with one another than the IP address become necessary. Good site to check your PC's IP address.
IP address is used to identify the PC in network. It is also called the physical address of your computer. It is very necessary to find IP address to send and share file through network.
IP address is a numerical label assigned to each device participating in a computer network that uses the Internet to communication.Within an isolated network, you can assign IP addresses at random as each is unique.