Are UFO's real? Also extremely likely, somewhere in the universe.
Have aliens visited earth? Extremely unlikely - as in, probability so close to zero as to effectively BE zero. The universe is big, REALLY big.
Here's a question for all the "aliens have visited earth" crowd:
Today, almost everyone in any relatively developed country carries a phone with a very good camera, capable of shooting extremely clear photos and videos. Why then, has no one ever captured a single decent photo or video of an alien or an alien craft? Same goes for Bigfoot, Yeti, etc.
Because they have never been here (aliens), and because they don't exist (Bigfoot, Yeti).
“Why then, has no one ever captured a single decent photo...”
I have given this very question a lot of thought.
And after watching hundreds of hours of fuzzy unfocused videos of supposed aliens, ghosts, cryptids and the like, I have reached this conclusion: these entities do indeed exist, and are so smart as to appear only to idiots who couldn’t pour water out of a boot if the instructions were written on the heel, let alone operate the most basic smartphone camera. They are crafty devils, these “paranorms”! 😉