What is round robin and why it is used?

Round Robin is a scheduling algorithm that is used to allocate a set of resources, such as time or processing power, among a number of tasks or processes. It works by assigning each task or process a fixed time slice or “quantum” of resources, and rotating through the tasks or processes in a cyclical manner, giving each one a chance to use the resources before moving on to the next one. This allows each task or process to be executed in turn, ensuring that all of the tasks or processes receive a fair share of the resources.
Round Robin scheduling is often used in real-time operating systems, where it is important to ensure that all tasks or processes are given a chance to run in a timely manner. It is also used in other settings where it is important to allocate resources fairly and efficiently, such as in computer networks and in resource allocation for distributed systems.