How to Create Rest Based API in Magento 2?

Magento 2 API is straightforward and essential for integrating external applications. Start by defining your custom module and creating a new API file within it. Next, declare your API endpoints in the webapi.xml file, specifying routes and methods such as GET, POST, PUT, and DELETE. Implement the API logic in your PHP class files, adhering to Magento's service contracts and repository patterns for data handling. Magento 2 API Ensure proper authentication by configuring access control in the webapi.xml file.