Attitude refers to one's disposition, demeanor, and manner of doing things. It is shaped by underlying feelings and defines behavior. A positive attitude is caring, upbeat, and approaches life optimistically, while a negative attitude is rude and pessimistic. Attitude makes a big difference - with the right attitude, one can achieve their potential, but a bad attitude undermines success. Much of one's attitude lies below surface level, like the majority of an iceberg that is underwater and unseen.