IP is an abbreviation and stands for Internet protocol. Every PC or server that is connected to the Internet receives an IP address. The IP address is a number. It consists of four sets of numbers separated by periods and contains numbers between 0 and 255. The IP is used to uniquely identify every user, whereby data exchange can take place. A distinction is made between fixed IP's that always stay the same and dynamic IP addresses, which only apply for the time period of an Internet session.