SignalR is a feature in ASP.NET Core that we can use to create a real-time API. A real-time API is where data is pushed to connected clients when the data arrives at the server.
An example use case of a real-time API is on Twitter, where new tweets automatically appear in our feed as they are tweeted. Chat apps are another common example where we can get messages from other users immediately after they send messages.
Real-time APIs are different from REST APIs. With a REST API, the client needs to make a request to get new data that's available on the server. When there is no updated data, the response data in this type of request isn't needed by the client because it already has a copy of that data. So, this is an inefficient and slow approach to updating the client with new data. SignalR solves this efficiency problem because new...
