What is an IP Address? Source: whatismyipaddress.com
No doubt you've heard the term "IP address." Unless you're a techie, though, you may not have more than a shadowy notion of what an IP address actually is or how it works. Let's explore the concept.
An IP address is a fascinating product of modern computer technology designed to allow one computer (or other digital device) to communicate with another via the Internet. IP addresses allow the location of literally billions of digital devices that are connected to the Internet to be pinpointed and differentiated from other devices. In the same sense that someone needs your mailing address to send you a letter, a remote computer needs your IP address to communicate with your computer.