RESTful API Development refers to the creation of APIs (Application Programming Interfaces) that follow the REST (Representational State Transfer) architectural style. RESTful APIs are used to interact with web applications and enable communication between different systems over the internet. They allow client applications to access and manipulate data on a server through a set of well-defined, standardized operations (such as GET, POST, PUT, DELETE). RESTful APIs are typically built using HTTP, making them accessible and usable by a wide range of clients, including web browsers, mobile devices, and other servers. RESTful API development involves defining the data structures and operations, writing the server-side code to implement the API, and testing the API to ensure it behaves as expected. RESTful APIs are commonly used in modern web development, and are an important part of building scalable, secure, and high-performance web applications.