A RESTful API (Representational State Transfer Application Programming Interface) is a way for different software applications to communicate over the internet. It uses standard web protocols, like HTTP, to send and receive data. This makes it easy for developers to create, read, update, or delete information on a server using simple commands. In a RESTful API, resources are identified by unique URLs, and data is often exchanged in formats like JSON or XML. This approach allows for a clear structure and makes it easier to build scalable and efficient web services that can be used by various applications and platforms.