"4 PM" refers to the time of day that is four hours past noon. It is commonly used in both 12-hour and 24-hour time formats, where it is represented as 4:00 PM or 16:00, respectively. This time falls in the afternoon and is often associated with the end of the typical workday for many people. At 4 PM, various activities may take place, such as school dismissals, office meetings wrapping up, or public transportation schedules adjusting. It is also a common time for afternoon tea or snacks, as people take a break before dinner.