En informática, un bloqueo o congelamiento se produce cuando un programa de computadora, o todo el sistema deja de responder a las entradas. En el escenario más comúnmente encontrado, una estación de trabajo con una interfaz gráfica de usuario, todas las ventanas que pertenecen al programa congelado permanecen estáticas, y aunque el cursor del ratón se mueve todavía en la pantalla, ni escribir en el teclado ni el ratón haciendo clic produce ningún efecto en las ventanas del programa . El cursor del ratón también puede ser atrapado en una forma que indica que está esperando alguna operación para completar, como un reloj de arena o un cursor de espera que gira.

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In computing, a hang or freeze occurs when either a computer program or system ceases to respond to inputs. A typical example is a graphical user interface that no longer responds to the user's keyboard or mouse, but the term covers a wide range of behaviors in both clients and servers, and is not limited to graphical user interface issues. Hangs have varied causes and symptoms, including software or hardware defects, such as an infinite loop or long-running uninterruptible computation, resource exhaustion (thrashing), under-performing hardware (throttling), external events such as a slow computer network, misconfiguration, and compatibility problems. The fundamental reason is typically resource exhaustion: resources necessary for some part of the system to run are not available, due to being in use by other processes or simply insufficient. Often the cause is an interaction of multiple factors, making "hang" a loose umbrella term rather than a technical one. A hang may be temporary if caused by a condition that resolves itself, such as slow hardware, or it may be permanent and require manual intervention, as in the case of a hardware or software logic error. Many modern operating systems provide the user with a means to forcibly terminate a hung program without rebooting or logging out; some operating systems, such as those designed for mobile devices, may even do this automatically. In more severe hangs affecting the whole system, the only solution might be to reboot the machine, usually by power cycling with an on/off or reset button. A hang differs from a crash, in which the failure is immediate and unrelated to the responsiveness of inputs.

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