List four activities of a typical operating system.

1. Memory Organization: One of the main activities of the operating system is to organize the memory for the program execution.

2. File System (and disk) management: Operating System has different types of file systems to identify the file type and so how it could be executed.

3. Program execution + Multitasking (in modern OSs): Program executions are dependent upon the clock cycles of a CPU. A system has to run multiple programs simultaneously on a single CPU that is done by multi-threading so that each program gets it proper clock cycles.

4. Hardware detection and management: It is also one of the main activities of operating system.

In order to use different hardware like mouse, keyboard, and printer connected to the CPU.