What do you mean by long polling?

• Long polling, which doesn't employ a specific protocol like WebSocket or Server Side Events, is the simplest method of maintaining a connection with a server. In addition to being incredibly simple to use, it is frequently sufficient.Server programmes can hold a client connection open for a long period of time by using a technique called long polling.

A method called HTTP Long Polling is used to send data from the server as quickly as feasible to a client. As a result, there is no need for the server to wait for a request from the client.Once it gets a request from the client, the server does not cut off the connection in long polling. Instead, the server only responds when a timeout threshold is met or a new message becomes accessible.