The defining characteristic of an RTOS is its deterministic behavior, where processes must be completed within defined time constraints.

Multitasking uses context switching to rapidly switch the CPU between tasks, making it appear as if they are executing at the same time.

Hard real-time systems are used where a failure to meet a deadline is catastrophic, such as safety-critical systems like airbags.

Memory management tracks every memory location, determines who is allocating it, and decides who gets memory when it is free.

Spooling (Simultaneous Peripheral Operations On-Line) is a process where data is stored in a buffer so a device like a printer can access it at its own speed.

Preemptive multitasking allows the operating system to interrupt a currently running process to allocate CPU time to another task.

The kernel is the central component of an OS, acting as the bridge between application software and the underlying hardware.

Multi-user operating systems allow multiple users to connect to a single computer system (usually a server) and perform tasks concurrently.

The CPU scheduler determines the order and timing of process execution on the CPU.

Batch processing operating systems group jobs with similar requirements into batches to be executed sequentially by the CPU to increase efficiency.

In a Hard Real-Time system, missing a deadline is considered a total system failure, whereas in Soft Real-Time, it is undesirable but not catastrophic.

Process Synchronization ensures that multiple processes that share resources are coordinated so that the integrity of data is maintained.

The objective of multiprogramming is to keep the CPU busy by switching between processes so that the CPU is never idle while waiting for I/O.

Real-time operating systems (RTOS) are specifically engineered for applications where time-bound response is critical.

The Kernel is the core component of the OS that manages hardware resources and provides fundamental services to software.

Time-sharing systems allow multiple users to interact directly with the computer, providing short response times by switching CPU time among them.

The dispatcher is the module that gives control of the CPU to the process selected by the short-term scheduler.

Multiprocessing refers to the use of two or more central processing units (CPUs) within a single computer system to increase computing power.

Swapping involves moving processes in and out of the main memory (RAM) to the backing store (disk) to allow more processes to run than can fit in RAM.