What is the difference between preemptive scheduling and time slicing

Question :What is the difference between preemptive scheduling and time slicing?
Answer :Under preemptive scheduling, the highest priority task executes until it enters the waiting or dead states or a higher priority task comes into existence. Under time slicing, a task executes for a predefined slice of time and then reenters the pool of ready tasks. The scheduler then determines which task should execute next, based on priority and other factors.