A week consists of seven days, which are typically divided into Monday, Tuesday, Wednesday, Thursday, Friday, Saturday, and Sunday. This structure is used in most cultures around the world and serves as a standard unit of time for organizing schedules and activities. The concept of a week has historical roots, with many cultures adopting a seven-day cycle. The Babylonians are often credited with this system, influenced by the seven celestial bodies visible to the naked eye. Today, the week is a fundamental part of calendars, helping people plan their lives and work efficiently.