A common question in operating system interview questions for freshers, don't miss this one. The features of the real-time operating system are -   Concurrency within an application - A programmer can indicate that some parts of an application should be executed concurrently with one another. The OS considers the execution of each such part as a process.  Process priorities - A programmer can assign priorities to processes.  Scheduling - The OS uses priority-based or deadline-aware scheduling.  Domain-Specific events interrupt - A programmer can define special situations within the external system as events, associate interrupts with them, and specify event handling actions for them.  Predictability - Policies and overhead of the OS should be predictable.  Reliability - The OS ensures that an application can continue to function even when faults occur in the computer