P.M. stands for "Post Meridiem," a Latin term meaning "after midday." It is used to indicate the time from noon (12:00 PM) to just before midnight (11:59 PM). This system helps distinguish between morning hours, which are labeled A.M. (Ante Meridiem), and afternoon/evening hours. In everyday use, P.M. is commonly found on clocks, schedules, and digital devices to clarify the time of day. For example, a meeting scheduled for 3:00 P.M. occurs in the afternoon, while a flight departing at 10:00 A.M. takes place in the morning. Understanding P.M. is essential for effective time management.