A week is a unit of time that consists of seven days. It is commonly used in calendars and is a standard measure for organizing time in many cultures. The days of the week are typically named as follows: Monday, Tuesday, Wednesday, Thursday, Friday, Saturday, and Sunday. The concept of a week has historical roots, with various cultures adopting the seven-day cycle for religious and practical reasons. In the Gregorian calendar, which is widely used today, weeks help structure daily activities, work schedules, and events, making it easier for people to plan and coordinate their lives.