An IP (Internet protocol) address is a set of numbers assigned to every computer on the Internet that helps identify each one. These numbers also help direct information to other computers. Each computer on the network has it's own unique IP address.
IP addresses have been assigned in the past based on a 32-bit number system called the IPv4. Many computers still use this system as of 2014. Because of the overwhelming popularity of computers, it was feared that these addresses would run out. However, in 1995, the IPv6 address was developed to allow an even greater number of addresses to be populated.