What are the services provided by the operating systems?

 Program Development

It provides a variety of services and facilities, such as debuggers and editor, to help the programmer in creating programs.

Program   execution

     It handles scheduling duties like implementation of programs and loading instruction and data into the main memory. Initializing files and I/O device.    

Access to I/O devices

OS provides a uniform interface that covers the inner details, thus that the programmer can access any device using simple read and writes.

 Controlled access to files

      For multiple users it provides protection system to access the file. It controls the right to use of the system and resources. It protects data and resources from unauthorized users.

Error detection and response

     OS provides response that clears both external and internal hardware errors.