The word Buddha means "awakened one" or "enlightened one". The Buddha was an "ordinary" human like you and me before he became enlightened. Enlightenment is compared to waking up, because we suddenly experience a complete transformation of body and mind when we wake up. A Buddha is a person who has developed all positive qualities and eliminated all negative qualities. One could say that a Buddha represents the very peak of evolution, as he/she is omniscient or all-knowing. With his wisdom, a Buddha really understands the truth, whereas ordinary people live like in a dream, an illusion that prevents us from understanding reality properly.
Idols / Statues in the Hindu temples are not mere statues, they are physical bodies which have been energized to vibrate in a certain way such that they impact everything around them. The entire concept and the science behind the idols and their handling is given under Agama Shastra, a tantric scientific methodology that has been perfected over many millenia. The idol as indeed the entire temple becomes a vibrating body that can impact any person that is in the vicinity of the temple. This practice of energizing idols was traditionally known as “Prana Prathishta“, literally meaning Establishment of the Life force in the idol. In English, although not completely consistent, we could use the word consecration for it.