Daylight Saving Time (DST) is the practice of moving the clocks forward by one hour during the warmer months to make better use of natural daylight. This usually happens in the spring, when clocks are set forward, and is reversed in the fall, when they are set back. The main idea is to extend evening daylight, allowing people to enjoy more outdoor activities after work or school. The concept was first proposed by Benjamin Franklin in the 18th century, but it wasn't widely adopted until the 20th century. Many countries participate in DST, believing it helps save energy and reduce electricity consumption. However, some people argue that the time change can disrupt sleep patterns and daily routines.