Download test tells you how fast you can get data (files, movies, music) from the Internet. The result is shown in Mbps (megabits per second).

Upload test tells you how fast you can send data (files, movies, music) to the Internet. The result is shown in Mbps (megabits per second).

IP Address is the server or client Internet address for a communication. There are private IP addresses and public IP addresses. The public IPs are unique.