A WebSocket is a connection that stays open between a browser and a server, letting both sides send messages whenever they want. Normal web traffic works like sending a letter: you ask, you wait, you get one reply, and the line closes. A WebSocket is more like a phone call that stays connected, so either party can speak the instant there is something to say.
The everyday example is a chat app. When a friend types a message, you see it appear right away, with no refresh and no waiting. The server pushes that message down the open connection the moment it arrives. The same idea powers live sports scores, collaborative documents where you see other people’s cursors, and dashboards that update on their own. Unlike a standard HTTP request, the link does not close after one answer.
WebSockets often work alongside a regular API for the rest of the app. The API handles ordinary loads and saves, while the WebSocket carries the fast, two-way traffic that needs to feel instant.
There is a cost to that always-on link. Every open WebSocket holds a slice of server memory, so a popular app needs a server built to keep thousands of connections alive at once. They can also drop when a phone switches from Wi-Fi to mobile data, so good code quietly reconnects and resends what was missed. For updates that arrive only now and then, plain polling is simpler and often cheaper than keeping a socket open for nothing.
At TopDevs we reach for WebSockets when a product genuinely needs live updates, and stick to simpler methods when it does not, so you are not paying to keep connections open you will never use.
