A Web API (Application Programming Interface) is a way for different software applications to communicate with each other over the internet. Think of it like a waiter in a restaurant: You (the client) place an order The waiter (API) takes it to the kitchen (server) The kitchen prepares the food The waiter brings it back to you Simple Definition A Web API allows one application to request data or services from another application using the web (usually via HTTP). How It Works (Basic Flow) A client (browser, mobile app) sends a request The server receives it The server processes it The server sends back a response (usually in JSON or XML) Example When you open a weather app: The app sends a request to a weather API The API returns data like temperature, humidity, etc. Key Concepts 1. HTTP Methods These define what action you want to perform: GET ? Retrieve data POST ? Send data PUT ? Update data DELETE ? Remove data 2. Endpoints An endpoint is a URL where the API can be accessed. Example: https://api.example.com/users 3. Request & Response Request ? What you send (URL, method, headers, body) Response ? What you get back (data + status code) 4. Status Codes 200 ? Success 404 ? Not found 500 ? Server error 5. JSON (Most Common Format) Example response: { "name": "Rahul", "age": 25 } Types of Web APIs REST API (most popular, beginner-friendly) SOAP API (older, more complex) GraphQL API (flexible queries) Beginner Example (Using JavaScript) fetch('https://api.example.com/users') .then(response => response.json()) .then(data => console.log(data)); Hope this helps.Please mark as Accepted Answer if this answer your query.

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