Why is AREA-51 so confidential!?

I'm not live in America and never seen area-51 so I don't know what is going on there. I just hear it from issues say there is Ufo plane crash on there. :p

Why, ALIENS, of course. What esle? LOL. Who knows what is in Area-51. There are so many things that our government keeps secret from the citizens. Especially back then. It is probably failed experiments, or something they screwed up that cost a lot of money. They just did not want to let the people know, because it might have caused them to lose any funding. It could also have been an old Air Force testing site. That oculd be why there were reported sightings of spaceships. I am not going to say that there is not any other life forms out there somewhere, it is an extremly vast universe. I honestly think that is was a coverup, a big expensive mistake the government made, and they still want to keep it a secret.