UTC and GMT represent same time. Then why we have different names. what is difference between UTC and GMT?

ANSWER TO THE ABOVE QUESTION UTC and GMT represents the same time almost yet they are different if considered carefully. Greenwich Mean Time is defined as the solar time at the royal observatory, Greenwich. It was developed to track time based on rotation of the earth. UTC or coordinated universal time is considered as an atomic time scale and differs from GMT by 0.9 secs.