Created out of an inferior block of marble in Florence, Italy and standing at 14 feet tall, Michelangelo's David was considered different from other interpretations of the biblical figure (examples of statues: see Bernini's, Donatello's, and Verrocchio's pieces. An example of a painting version: see Caravaggio's 'David with the Head of Goliath') because it focused on harmony, balance and the ideal form as well as it's unique way David is presented.
His sculpture showcases said artistic sensibilities through his highly detailed anatomy and lifelike posture as well as displaying a form of stance originally implemented in Greece with a sculpture known as Doryphoros of Polykleitos called contrapposto.
It also differed from the other sculpture interpretations of David because it displayed him as a young man minutes before the battle between himself and Goliath, while traditional depictions of the biblical character were usually of a young boy minutes after Goliath was slain, standing triumphant and proud.