*  Some of the widely used operating systems are as follows:-    1. Batch operating system.    2. Time-Sharing oprtaing system.   3. Distributed operating system.   4. Network operating system.   5.  Real-Time operating system. 1> Batch Operating System:-                 This type of operating system does not directly interact with computer system. Each user prepares job on an offline device such as punch card and submmits to the computer operator.   There is an operator which takes similar jobs having same requirement and group them into batches. * Advantages of Batch Operating System:-   Repeated jobs are done fast in batch systems without user interaction.   You don’t need special hardware and system support to input data in batch systems.   Best for large organizations but small organizations can also benefit from it.   Batch systems can work offline so it makes less stress on processor.   The idle time batch system is very less.  Multiple users can share