Multi-Processing Module (MPM)

Apache Multi-Processing Modules (MPMs) provides portable multiprocessing to Apache HTTP Server and is used to change and add new functionality to the web server, changes how Apache listens on the network, handles those requests, natively rewriting URLs to support SSL encryption. Apache offers three MPMs to choose - Prefork, Worker, and Event. The modules load these requests at compile or run time after the user chose the features, characteristics or modules to be included with a server request using MPM.