HTTP Handlers and HTTP Modules

Every web request to an asp.net application is handledby http handlers.httphandlers are classes that are designated to process webrequest. There are separate handlers for each URL request.It means .aspx, .asmx file extensions are handled by different httphandlers.For example to request an asp.net page which has .aspx extension, request is handled by pagehandler,System.Web.UI.PageHandlerFactory