Time sharing system is
Time sharing system is Round Robin.
Time-sharing is a technique which enables many people, located at various terminals, to use a particular computer system at the same time. Time-sharing or multitasking is a logical extension of multiprogramming. Processor's time which is shared among multiple users simultaneously is termed as time-sharing.
The schedular is the part of the operating system that determines when to switch between processes, and which process to switch to. A round robin scheduler is one particular type of scheduling strategy that could be used in a time sharing computer, but there are other possible scheduling strategies as well.
Round robin is a CPU scheduling algorithm where each process is assigned a fixed time slot in a cyclic way. It is simple, easy to implement, and starvation-free as all processes get fair share of CPU.