How does priority scheduling work and what is starvation?

Priority scheduling assigns priorities to processes; CPU is allocated to highest priority ready process. Can be preemptive (higher priority preempts running process) or non-preemptive. Starvation occurs when low-priority processes never execute because higher priority processes keep arriving. Solution: Aging - gradually increase priority of waiting processes. Priority can be static or dynamic. Unix nice values range -20 (highest) to 19 (lowest).