SignalR Study Portal

TL;DR

SignalR is ASP.NET Core's real-time bidirectional messaging library: server hubs expose RPC methods to clients and can push to one, many, groups, or specific users, with automatic transport negotiation (WebSockets → SSE → long polling), reconnection, and DI integration. Senior engineers care because it solves the hard parts of live dashboards, chat, notifications, and streaming feeds — group management, auth via JWT in query strings, strongly-typed client contracts, and horizontal scale via a Redis backplane or Azure SignalR Service.