Web Intermediaries (WBI - pronounced "webby") is a framework and set of programming tools from IBM for the uniform creation and control of intermediary programs such as proxy servers, transcoding processors, and any kind of program that sits somewhere between two end points in a network. Some other kinds of intermediary programs that can be built using WBI include personalization of Web content; transcoding HTML for formatting to a handheld device; interactivity with other Web users and data; the filtering of content; and, more controversially, the monitoring of individual usage.
A WBI application consists of a request editor, a (response) generator, a response editor, and a monitor. A collection of such a monitor, editors, and generator is known as a MEG, and a MEG constitutes an installable plugin. Plugins are registered in a computer and made usable whenever they are needed or wanted.