A task manager is a system monitor program used to provide information about the processes and programs running on a computer, as well as the general status of the computer. Some implementations can also be used to terminate processes and programs, as well as change the processes priority. task manager is a system monitor program used to provide information about the processes and programs running on a computer, as well as the general status of the computer. Some implementations can also be used to terminate processes and programs, as well as change the processes priority.