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HTTP, DNS, IPs & Networks
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00:00:02 The entire handshake between the client and the server happens in a flash, faster than Thanos can snap his fingers.
00:00:09 But for it to be that quick, computers need to speak the same language.
00:00:14 Just like we have different languages, computers follow rules of communication, called protocols.
00:00:20 And the most important one, HTTP, Hypertext Transfer Protocol.
00:00:26 It's the backbone of the Internet.
00:00:28 When you type google.com in your browser, it uses HTTPS, the secure version, to talk to Google servers.
00:00:36 But before your device can send that request, it needs to find the server.
00:00:41 And that's where DNS comes in.
00:00:43 We use easy-to-remember names, like google.com, but computers need IP addresses, like 192.168.11, to find each other.
00:00:54 And the domain name system, or a DNS, is like the internet's phonebook.
00:00:59 It translates the main names into IP addresses.
00:01:03 Here's how it works.
00:01:04 You type in google.com, the browser checks if it already knows the IP, and if not, it asks the DNS resolver.
00:01:12 The resolver searches for the IP address, and once found, your browser uses that IP to connect to Google servers.
00:01:19 But what's an IP anyway?
00:01:21 An IP address is a unique number that identifies every device on the internet.
00:01:27 Think of it as your device's home address.
00:01:30 There are two types, IPv4, which is a classic format, but we're running out of these.
00:01:36 And there's IPv6, which is a newer format designed to support more devices.
00:01:41 So now you know how your device connects to a server, but how does it know what to ask for?
00:01:48 That's where APIs come in.