Watchdog  timer is also known as COP or computer operating properly which is a software or electronic timer used not only to detect but also to recover from computer malfunctions. They are used in computers to facilitate automatic correction of hardware  faults that are temporary and to prevent malevolent or errant software from disrupting system operation.
Benefits of Watchdog timers include:
Saves time and money
Without any human intervention resets automatically
To monitor the software debugs, no need to place the employers
Increases the system performance