DNS stands for Domain Name System. DNS is the address book of the internet, mapping IP addresses to the domains that people type in. It’s what allows us to type in www.bloggerstoolkit.com when we want to go to The Blogger’s Toolkit website rather than the string of numbers (the IP address) that represents the location of the content that lives on the website. The system itself is comprised of multiple levels of servers that communicate with each other to locate the information that an internet user is requesting when that user types in a web address.