IP ( Internet Protocol ) address is and identificator that each computer and network owns. Computers use IP address to communicate with eatch other.
Public and Private IP
There are actually 2 IP addresses. Public is the one your network (router) has, which is used on the internet. Private is the one that your computer has, which is used locally in your private network.
How to find your public IP address
The easiest way to find your public IP address is to google it or use any other website that offers such a function.
Google: "What's my ip"
Another way is to check your public IP from the router settings and configurations, but i'm not taking up that subject in this post.
How to find your private IP address
From the control panel