There are 24 time zones on Earth, each identified by a letter of the alphabet. Your time zone is determined by your geographical location and the time within that zone. UTC, or Coordinated Universal Time, is the global time standard and is used to compare the times in different zones.
UTC is not used for standard time in any one time zone, but is instead used to establish the time for the world. If you try to view content that includes UTC, you will receive an error message.