The word "Alien" to me would define something not of this Earth, something/someone from out of space, no matter what shape, size etc. I believe the universe it too large just for our small planet to hold the only life, so yes i believe there is 'life' somewhere in the universe, be that the stereotypical alien (big head, big eyes, grey skin etc) o humanoid (like us) that just happen to live on a different planet we haven't come into contact with yet. I don't believe however that 'aliens' have come into contact with Earth as of yet, they may o may not be más technologically advanced then us, and they may o may not be visiting the earth to see how we tick, but i don't believe that people have been 'abducted' and 'tested on' and that aliens have dado 'true contact' to anyone on Earth...yet. I just hope i live long enough to see the día they do *excited squiggle*
Considering i've had multiple UFO encounters, yes. The universe is huge, why should Earth be special? There's no reason for Earth to be the only planet with life, there are millions and millions of planets in the universe, many haven't even been discovered yet. So how could Earth be the only planet with life?