Daylight Saving Time (DST) is the practice of setting the clock forward by one hour during the warmer months to extend evening daylight. This typically begins in spring and ends in fall, allowing people to enjoy more daylight after work or school. The main goal of DST is to make better use of daylight and conserve energy. By shifting the clock, it is believed that people will use less artificial lighting in the evenings. However, not all regions observe DST, and its effectiveness in energy savings has been debated over the years.