Define "beauty is in the eye of the beholder"?

when ppl say that they usually mean beauty isnt fact, its perception and anything can have beauty its just not everybody sees it. its like a concept that who are we to declare something officially unattractive. so the beholder is just any person looking at something/somebody. for example u could think somebody was very attractive and ur friends say 'how could u like him? hes so ugly!' and ud respond 'beauty is in the eye of the beholder.' hope i answered ur question well.