What is a queens pardon?

i was given a queens pardon in 1961.i was found quilty of receiving money knowing it to be stolen on the 29/12/1960 and remanded on bail until the 12/01/1961 when i was conditionally discharged. on the 25/07/1961 i received a queens pardon. i was a juvenile at the time ,i have it on the wall in my study.