What is the role of SignalR in C#?

SignalR is a real-time communication library that allows developers to easily establish real-time, bi-directional communication between clients and servers. It can help developers build web applications with real-time updating features, such as chat applications, online games, real-time voting, and more. SignalR uses various technologies such as WebSocket, Server-Sent Events, and long polling to enable real-time communication. With SignalR, developers can quickly and simply implement real-time communication functionality, improving user experience and interactivity.