RESTful Web Services are a modern architectural style for designing networked applications. They utilize the principles of Representational State Transfer (REST) to enable communication between clients and servers over the internet. RESTful services are built on standard HTTP methods such as GET, POST, PUT, and DELETE, allowing for easy interaction with resources identified by unique URIs. This approach promotes statelessness, meaning each request from a client contains all the information needed for the server to fulfill it, enhancing scalability and performance. RESTful Web Services are widely adopted due to their simplicity, flexibility, and ease of integration across various platforms.