Sometimes we need to know what is the IP address of our PC. For that first we need to understand what is IP address. IP address is a number assigned to every computer that is connected to it, to identify it in a network of computers. Every PC connected to internet will have unique IP Address. For Ex: It will be like 220.127.116.11
There will be two types of IP addresses. One is STATIC IP and the other is DYNAMIC IP. Normally the companies and big organisations will be provided with STATIC IP on request. STATIC IP will not change. But for home PCs, the service providers will assign DYNAMIC IPs which changes every time you connect to the Internet.
Here is the way to know your IP address.
Go to http://whatismyipaddress.com/ . This website immediately shows IP address of your machine. It also shows your location i.e. your city and state , country and the type of connection(BROADBAND or low bandwidth connection ) you have etc. And it also shows the your PC location in map.
Using the site http://whatismyipaddress.com/ you can trace location of any PC if you have its IP address. If anybody sends any spam you can trace his loaction if you have his PC IP.