Web vs Internet (Deep Dark Web Pt1) – Computerphile

So we’re gonna talk about the difference between the web, the internet, the dark web, and the deep web but in order to talk about all of these things and figure out why they’re different we need to start with the basics of the web and the internet because most people confuse those as well as confusing the deep web and the dark web and how they’re different and we’re just gonna try and figure all that out today – how they’re separate so we’ll start off with the internet what is the internet versus the web? The internet is the physical connection of all the computers that are joined together across the world that’s probably the easiest way of looking at it. it started off with ARPANET in the late 60s which was, uh, research agencies getting together to connect their computers from a long distance and this is when computers were huge things in massive rooms not little things we have in our office and then that graduated to the NSFNET, which was the National Science Foundation net which was, uh, all the universities connecting together into a, kind of, bigger network and then that eventually, in the start of the 90s became the internet, where they connected more broadly to commercial networks as well as research networks and when you connect to the internet from your home, on your computer your computer simply connects to the internet and becomes one of the many computers on the internet so what I have here is a picture of several computers joined together in a network so the computers are circles, and the network is the lines between them which is nice, and then when you’re at home and you turn on your computer and it connects to Virgin Media or whoever you simply crop up on the internet and then it connects you to one of the computers and suddenly you’re part of the whole big internet Now, every computer on the internet has what’s called an IP address and it’s just an address which is unique to that computer on the internet and so even when your computer connects to it, you get your own IP address and if you want to know what that is, you can just go to Google, type in “IP address”, and Google helpfully tells you “your IP address is this” [offscreen] I was just imagining about a thousand people doing that right now in another tab while we’re- All the computers just have this unique address, and it’s like a sort code for a bank, as in every branch of a bank has a unique sort code and when you are sending money there it goes to that, uh, address based on that sort code and so every computer has this IP address on the internet and it allows computers to know which exact computer they’re talking to when they’re asking for information. So, what is the web? The web is, uh, the software that runs on the physical internet so it’s a software layer essentially, that is a way of, uh, sharing information across all those different computers The web is just one type of software on the internet other types of software include email exchange, uh, file transfer protocols, where you can send files to other computers rather than download webpages from them so it’s just a type of software that runs on the physical internet and that’s an important difference that we’re get to when we get to dark web and deep web So, how do you view the web? You have something like Chrome or Safari, and these are web browsers and they just know how to talk to the web to ask for pages and to get things And so we have these browsers on our computers in order to view or access the web [offscreen] We also have a lot of apps these days, are they just using the same sort of technology? Yes, yeah, so, um, when your phone connects to the internet over 4G or 3G or via wifi it’s again – it gets its own IP address and apps are just sending information across that physical network not necessarily using web software, but using similar communications to how web software communicates with each other these are down at the protocol levels and the ports that they’re connecting over There’s two key bits of the web which make it work, two bits of the software one is URLs – unique resource locators – and these are nice easy ways for you and me to say which website we want to get to or which webpage we want to see. And so this bit of software that helps the web work is essentially a long list of, uh, if you want to go to nottingham.ac.uk you ask the server and the server says “oh, I know which physical computer that’s stored on – it’s stored on” [offscreen] so, you’re reading that? [laughs] I am, just from down here And so actually, in your web browser, you can either type in nottingham.ac.uk and go to the website or you can, uh, type in 1., uh, and it will show you the same webpage, cause the webpage is stored on that physical computer and so that’s how it knows which computers on the internet to ask for which webpage you want to see the next bit you then need is an http server – a hypertext transfer protocol server got that right, hopefully and this is just the software that runs on those physical computers that says “oh, you want that page. Sure, here you go, I’ll give it to you” so the nottingham.ac.uk server has an http server on it which says “here you go, here’s the page you wanted” and sends it to the person who’s looking and so when you type in http://www.nottingham.ac.uk, you’re basically saying “I want to use the hypertext transfer protocol to look at the worldwide web part of nottingham.ac.uk” however, you could use different protocols to look at different parts of nottingham, like the file transfer bit One nice way of looking at the web is that it’s a whole lot of information pages all of which say “ooh, look, there’s some interesting information on that page over there” and so you click on the link, which is the unique resource locator, or the URL and it sends you over to that page, and it goes “oh, I know another interesting page you might want to look at. Go look at this one” and you click on it, it goes over there and that’s what hypertext is it’s just text with links in it – makes it hypertext [offscreen] So that’s when we all get stuck down the rabbit hole, yeah? Yeah, you follow links forever, and so they’re, the thing they say about Wikipedia is that you’re suddenly viewing an endless number of links, all of which are very interesting and following each other forever and ever and ever and suddenly, five hours later, you realize you haven’t had any dinner yet and it’s bedtime [offscreen] And you haven’t found out the thing you went on for in the first place No, not at all [laughs] There’s four nice examples of what makes the deep web different from the web one is that stuff behind passwords – so any place that you go, where you have to type in a password is a place that Google can’t go cause it doesn’t have your password, so it can’t look at your bank information, uh, it can’t look at your profile… [fades out]


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