Seasonal time changes refer to the practice of adjusting clocks to make better use of daylight during different times of the year. This is commonly known as Daylight Saving Time, where clocks are set forward in spring and set back in fall. The main goal is to extend evening daylight, which can help save energy and encourage outdoor activities. Not all regions observe seasonal time changes. Some areas, like Hawaii and most of Arizona, do not participate in Daylight Saving Time, choosing to keep their clocks the same year-round. This can lead to differences in time between regions, affecting travel and communication.