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A real-time operating system (RTOS) is an OS that guarantees real-time applications a certain capability within a specified deadline. RTOSes are designed for critical systems and for devices like microcontrollers that are timing-specific. RTOS processing time requirements are measured in milliseconds. Any delays in responding could have disastrous consequences.
Real-time operating systems have similar functions as general-purpose OSes (GPOSes), like Linux, Microsoft Windows or macOS, but are designed so that a scheduler in the OS can meet specific deadlines for different tasks.
RTOSes also commonly appear in embedded systems, which are a combination of hardware and software designed for a specific function and may also operate within a larger system
Examples of the real-time operating systems: Airline traffic control systems, Command Control Systems, Airlines reservation system, Heart Pacemaker, Network Multimedia Systems, Robot etc. Hard Real-Time operating system: These operating systems guarantee that critical tasks be completed within a range of time.
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