KYU-DO (Japanese Archery) demonstration.
You will find many word having -DO at the tail like as JU-DO, Ken-DO, Sa-DO or KA-DO. these "DO" is written as "道" meaning way or path originally.
These "DO" came from ancient Chinese philosophy "TAO-ism". TAO is reading of "道" in some era in China.
TAO-ism tell us "Everything has the way it should be". This concept is still kept in our mind deeply.