This template provides an overview of the fundamental concepts and architectural constraints of the REST API (Representational State Transfer API), a software architectural style used for designing networked applications. The template explains several critical elements of REST API through distinct sections. The first section showcases constraints of REST architecture, including Uniform Interface, Stateless, Cacheable, Client-Server, Layered System, and Code on Demand. The second section details key API concepts such as the full forms of API and REST, transmission, and common methods (GET, POST, PUT, PATCH, DELETE). Another section discusses additional related terms and concepts like API endpoints, payload, and SOAP API. This template is highly beneficial for developers, software engineers, and technical professionals needing to understand how to effectively use and design REST APIs.