An IP address is a number your Internet Service Provider (ISP) assigns to your computer to identify it on the Internet. The IP address is made up of 4 numbers separated by periods (e.g., 126.96.36.199).
If you have a static IP address, your ISP assigns an IP address to your computer permanently, and it doesn't change. Some ISPs assign dynamic IP addresses. The computer is assigned a temporary IP address that lasts as long as your Internet session is open. You may have a different IP address each time you start an Internet session when using dynamic IP addresses.