1. What is an API?

Learning Objectives Define what an API is and explain its purpose using the client-server model. Identify the key components of an API request: the endpoint, HTTP method, and parameters. Differentiate between a request and a response in an API interaction. Interpret a simple JSON response to extract specific data. Explain how APIs enable different applications to communicate and share data securely. Provide at least three real-world examples of APIs in action. Ever wonder how your weather app gets the live forecast, or how you can log into a new game using your Google account? 🌦️ That's the magic of APIs at work! In this lesson, we'll explore Application Programming Interfaces (APIs), the invisible messengers of the internet. You'll learn how they allow diffe...

TermDefinitionExample API (Application Programming Interface)A set of rules and protocols that allows one software application to interact with and request data or services from another application. Think of it as a waiter in a restaurant: you (the client) don't go into the kitchen (the server's database), you give your order (a request) to the waiter (the API), who brings you your food (the data).The YouTube API allows a third-party app to search for videos and display them within its own interface, without needing access to YouTube's entire database. ClientThe application that initiates a request to an API. It's the program that needs the data.Your web browser is a client when it requests a webpage from a web server. A weather app on your phone is a client when it re...

The Request-Response Cycle 1. Client sends Request -> 2. Server receives and processes Request -> 3. Server sends Response -> 4. Client receives and uses Response This is the fundamental pattern for all API interactions. The client always initiates the conversation by making a request, and the server's job is to provide a response. Anatomy of a GET Request HTTP Method + Endpoint + ? + Parameters This is the structure for asking for data. The 'GET' method means you are retrieving information. The Endpoint is the specific URL for the data you want. Parameters (after the '?') filter the request, like asking for a specific city's weather. Example: `GET https://api.weather.com/forecast?city=London&units=celsius` Structure of a JSON R...