Why It Matters
REST APIs are the standard that most modern software is built on. When you are evaluating whether two systems can integrate, the first question is usually whether they offer a REST API. If they do, the connection is generally straightforward. If they do not, integration becomes more complex and expensive. Understanding that REST is one style of API, not the only kind, also helps you follow conversations about alternatives like GraphQL and know when your team is recommending something outside the norm. You can learn more about API integrations and what they involve in practice.
Example
Your mobile app needs to display a customer’s order history. The app sends a request to your server’s REST API at an address like /api/orders/customer/1234. The server looks up the data, formats it as a structured response, and sends it back. The app displays the results. Every screen in the app that shows data from your server is making these kinds of REST API calls behind the scenes.
For more technical terms explained in plain English, see the glossary.
