A Buddha is a person who has developed all positive qualities and eliminated all negative qualities. A Buddha was an “ordinary” human like you and me before he/she became enlightened. Enlightenment is compared to awakening, as a person suddenly experiences a complete transformation of body and mind from sleeping to waking up. One could say that a Buddha represents the very peak of evolution, as he/she is omniscient or all-knowing.
Sakyamuni Buddha, is one among the thousand Buddhas of this aeon. These Buddhas were not Buddhas from the beginning, but were once sentient beings like ourselves