'DST' is an abbreviation for 'Daylight Saving Time', which originated from the concept of adjusting clocks to make better use of daylight during the longer days of summer.

The concept of DST was first proposed by George Hudson in 1895 and was later adopted by several countries during World War I to conserve energy.

Initially, DST was meant to save energy by reducing the need for artificial lighting in the evening, but its modern usage also focuses on making better use of daylight.