An hour is a unit of time that is equal to 60 minutes. It is commonly used to measure the duration of events, activities, and schedules. The concept of hours is essential in daily life, helping people organize their time for work, school, and leisure. There are 24 hours in a day, which is divided into two 12-hour periods: AM (from midnight to noon) and PM (from noon to midnight). The hour is part of the larger system of time measurement, which includes seconds and minutes. It is represented by the symbol "h" and is used in various contexts, such as in clocks and timers. Understanding hours is crucial for effective time management and planning in both personal and professional settings.