WEBVTT 00:00.000 --> 00:02.400 Software development, different applications 00:02.400 --> 00:04.800 often need to communicate with each other. 00:04.800 --> 00:07.720 For example, a weather app displaying temperature data 00:07.720 --> 00:09.840 from an online weather service. 00:09.840 --> 00:12.520 That's where APIS come in. 00:12.520 --> 00:15.360 Application programming interface is a set of rules 00:15.360 --> 00:18.080 and protocols that allows different software components 00:18.080 --> 00:19.600 to communicate. 00:19.600 --> 00:21.680 Think of it like a restaurant menu. 00:21.680 --> 00:23.640 The menu list dishes you can order, 00:23.640 --> 00:26.160 and when you place an order, the kitchen prepares it 00:26.160 --> 00:27.080 and delivers it. 00:28.080 --> 00:34.080 Similarly, an API provides a list of available services or data. 00:34.080 --> 00:37.080 The client, like an app, requests what it needs. 00:42.080 --> 00:44.080 And the server sends back the response 00:44.080 --> 00:45.680 through a defined interface. 00:45.680 --> 00:49.880 So, APIS act as bridges that allow software systems 00:49.880 --> 00:53.080 to interact without knowing each other's internal details. 00:53.080 --> 00:55.080 APIs are essential because they make 00:55.080 --> 00:58.080 modern applications work together seamlessly. 00:58.080 --> 01:01.080 They enable integration between different services. 01:01.080 --> 01:04.080 For example, a travel app that combines flight booking 01:04.080 --> 01:07.080 with live weather updates or maps. 01:07.080 --> 01:09.080 They also allow separation between the front end 01:09.080 --> 01:12.080 and back end of an application. 01:12.080 --> 01:15.080 This means developers can update how an app looks front end 01:15.080 --> 01:19.080 without affecting how it works behind the scenes back end. 01:19.080 --> 01:22.080 Most importantly, APIS encourage modular 01:22.080 --> 01:24.080 and scalable architectures. 01:24.080 --> 01:28.080 Each part of a system can be developed independently, 01:28.080 --> 01:32.080 making it easier to maintain and expand over time. 01:32.080 --> 01:35.080 APIS come in different forms depending 01:35.080 --> 01:38.080 on how they are designed and used. 01:38.080 --> 01:39.080 Restful APIs. 01:39.080 --> 01:42.080 These are the most widely used. 01:42.080 --> 01:45.080 Rest APIs rely on HTTP methods such as 01:45.080 --> 01:49.080 Get, Post, Put, and Delete to manage data. 01:49.080 --> 01:52.080 They are simple, lightweight, and usually exchange information 01:52.080 --> 01:56.080 in J-S-O-N format. 01:56.080 --> 01:59.080 Simple Object Access Protocol is an older protocol 01:59.080 --> 02:03.080 that uses XML to send messages between systems. 02:03.080 --> 02:09.080 It's more structured and secure, often used in enterprise environments. 02:09.080 --> 02:12.080 GraphQL APIs. Brief mention. 02:12.080 --> 02:15.080 A query-based approach where clients can ask for exactly 02:15.080 --> 02:18.080 the data they need. Nothing more, nothing less. 02:18.080 --> 02:21.080 This makes data retrieval more flexible and efficient. 02:22.080 --> 02:25.080 Each type of API serves a different purpose 02:25.080 --> 02:28.080 and developers choose based on the project's needs, 02:28.080 --> 02:32.080 whether it's speed, flexibility, or security. 02:32.080 --> 02:37.080 APIS are everywhere in our daily digital experiences. 02:37.080 --> 02:40.080 Social media APIs like Facebook and Twitter 02:40.080 --> 02:43.080 allow apps to post or retrieve user feeds. 02:43.080 --> 02:46.080 Payment APIs such as Stripe and PayPal 02:46.080 --> 02:48.080 handle secure online transactions. 02:49.080 --> 02:52.080 Maps and Geocoding APIs like Google Maps 02:52.080 --> 02:55.080 provide location and navigation data. 02:55.080 --> 02:57.080 For a quick classroom exercise, 02:57.080 --> 03:01.080 think about the APIS you use every day. 03:01.080 --> 03:03.080 Log in via Google on a third-party app, 03:03.080 --> 03:05.080 checking whether on your phone 03:05.080 --> 03:08.080 or using maps to find a nearby cafe. 03:08.080 --> 03:14.080 All these use APIS to share data between applications instantly. 03:14.080 --> 03:19.080 Quick discussion. How do APIS impact the apps you use daily? 03:19.080 --> 03:22.080 They make web and mobile applications more powerful, 03:22.080 --> 03:25.080 interactive, and interconnected.