Single-tasking allows all the resources of a system to be devoted to that single task.

Generally, it will be single-user, single tasking.

Multi-tasking.

Single-tasking systems would not be able to run multiple programs at once(for example drivers and a browser).

these types of operating systems can not used for multitasking.

As the name suggests, a single tasking operating system is designed to only allow one program to be run at a time. Most modern operating systems now employ multi-tasking in order to run programs concurrently.