ICANN

1. ICANN is a non-profit corportation in charge of the IP Address locations and Top-Level Domain name system mangement. So they basically take the IP Address numbers and give them a Domain Name, so it is easier for people to search for what they want.
2. A Domain Name System takes the IP Address numbers and gives it a Domain Name, ex. 64.233.167.99 is the IP Address for www.google.com. This system just makes it easier on the users searching for information on the internet.
3. ICANN role is to arrange all the managment of the techincal parts of DNS, so that it is easier for the users of the internet to find the right internet addresses. They do not have anything with the Top-Level Domain Names such as .com, .net, .org, and etc.