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⚡ Technology·2 min·Updated Mar 9, 2026

What is REST API?

Representational State Transfer Application Programming Interface

Quick Answer

A REST API is a way for different software applications to communicate over the internet using standard HTTP methods. It allows developers to access and manipulate data using simple requests and responses.

Overview

A REST API is a set of rules that allows different software systems to talk to each other over the internet. It uses standard HTTP methods like GET, POST, PUT, and DELETE to perform actions on resources, which are typically represented in formats like JSON or XML. This makes it easy for developers to create applications that can interact with other services, such as retrieving data from a server or sending updates to a database. One of the key features of REST APIs is that they are stateless, meaning each request from a client contains all the information needed to process that request. This allows for scalability, as servers do not need to remember previous interactions. For example, when you use a mobile app to check the weather, it sends a request to a weather service's REST API, which responds with the current weather data without needing to remember your last request. REST APIs are important in software development because they enable the creation of flexible and scalable applications. They allow developers to build services that can be easily integrated with other systems, which is essential for modern applications that often rely on multiple services to function. By using REST APIs, developers can focus on building their applications without worrying about how to connect to other services.

Frequently Asked Questions

The main advantages include simplicity, scalability, and the ability to work with different data formats. REST APIs use standard HTTP methods, making them easy to understand and implement.
REST APIs are stateless and use standard HTTP protocols, while other types of APIs, like SOAP, may have more complex rules and require more overhead. This makes REST APIs generally easier to use and integrate.
Yes, REST APIs are commonly used in mobile applications to fetch and send data. They allow mobile apps to communicate with servers and access resources like user accounts or product information.