Push technology

Push technology, also known as server push, refers to a method of communication on the Internet where the initial request for a transaction is initiated by the server, rather than the client. This approach is different from the more commonly known "pull" method, where information transmission is requested by the receiver or client.

In push technology, clients can express their preferences for certain types of information or data, typically through a process known as the publish–subscribe model. In this model, a client "subscribes" to specific information channels hosted by a server. When new content becomes available on these channels, the server automatically sends, or "pushes," this information to the subscribed client.

Under certain conditions, such as restrictive security policies that block incoming HTTP requests, push technology is sometimes simulated using a technique called polling. In these cases, the client periodically checks with the server to see if new information is available, rather than receiving automatic updates.