Mousetrapping is a technique used by some websites (usually pornographic websites) to keep visitors from leaving their website, either by launching an endless series of pop-up ads—known colloquially as a circle jerk—or by re-launching their website in a window that cannot be closed (sometimes this window runs like a stand-alone application, and the taskbar and the browser's menubecome inaccessible). Many websites that do this also employ browser hijackers to reset the user's default homepage