As you saw in the last video, URL's, domain names, IP addresses and 0:00 DNS are all quite closely tied to one another. 0:04 But because there's so many interesting things about each one, 0:08 every video in this stage will go over each in more detail. 0:11 Let's start with URL's and the man who invented them, Sir Tim Burners-Lee. 0:15 Sir Tim Berners-Lee invented the world wide web in 1989. 0:18 In his pursuit, he standardized many of the processes needed to make 0:23 computers talk to each other. 0:28 Uniform resource locators, or URLs are one of those processes. 0:30 One of the most wonderful parts of the web is how everything is connected. 0:37 Web pages are connected using what's called hyperlinks. 0:41 And behind every hyperlink is a URL. 0:45 Hyperlinks often look like the blue, underlined words on the page. 0:48 But they can also look like a lot of things these days, such as images or 0:53 buttons. 0:57 For example, 0:59 here on the YouTube page, Hyperlinks look like the titles of the videos. 1:00 When you click on one of these links, 1:06 your computer takes this URL to get a copy of the next webpage you request. 1:09 If the URL starts with http, the protocol used for the web, 1:15 the next bit in the URL, after the colon and two slashes, is the domain name. 1:20 Like teamtreehouse.com. 1:25 Any information after the domain name describes the full path to the resource. 1:28 However, more and more URLs have become shorter and shorter. 1:33 Nowadays, nearly everything is omitted in the address bar, including the http://, 1:37 the port number, and the full path to the resource. 1:43 The omission of all these details are called clean URLs. 1:48 But don't be deceived. 1:51 Just because you can't see these details, doesn't mean they're not there. 1:53 The one detail that's always left is the domain name, like teamtreehouse.com. 1:57 While this domain name will help users find resources on the web, 2:03 computers don't use names to find things. 2:07 They use numbers, and the numbers are called IP addresses. 2:09 Now that you're familiar with the parts of a URL, let's break down a few of those 2:14 parts in the next video, when we talk about domain names and IP addresses. 2:18