An IP (Internet Protocol) Address is a numerical assignment for each device (cell phone, iPad, laptop computer, printer etc) inside a network that uses the Internet Protocol for communication. Internet Protocol is responsible for routing information packets across network boundaries. It is the main protocol establishing the Internet.
An IP address serves two predominant functions. First is to host or network interface identification. Second, it provides location addressing. To put it bluntly, an IP address tells wherever you are connecting, to whom you are visiting, and where you are located.