Modern web applications demand live data. A cricket scorecard that updates the moment a wicket falls. A trading dashboard where prices change faster than you can refresh. A notification bell that lights up without polling. These are not nice-to-haves anymore — users expect it. The pattern behind all of them is the same: the server pushes updates to the client the instant something changes. No client asking "anything new?" every few seconds. Just a persistent connection and a steady stream of events. Why Real-Time Server-to-Client Communication Matters Think about how often an application needs to push data to a user rather than wait to be asked: Activity feeds — new comments, mentions, and collaboration events Server notifications — alerts, health dashboards, build and deployment progress Order and delivery tracking — status changes pushed to the customer in real time Sports updates — live scores and match events as they happen Price feeds — stock tickers, crypto prices, and market data In all of these, data…