UFO is the abbreviated of Unidentified Flying Object. I don't think that UFOs exist but I belive in the existence of living cells on other planets, appearance of life on a planet takes time ( like the story happend on the earth while smart life was forming on it), with billions of other planets in the universe there's a possibility that smart life might exist somewhere else.

acturally nobody knows it, but i think it's real exist.since so many planets in the universe,our earth can't be the only one that have creatures.so,ufo will appear sooner or later.

i dont tell you secret

for this qustion , in my opinion,i think ufo is unexit,