Motivation is defined as the driving force that initiates and directs behavior. It comes from internal needs and desires like biological needs for food and water or psychosocial needs for love and belonging. Motivation theories propose that humans are motivated to reduce drives or attain incentives. Key theories include drive theory which states behaviors are motivated by physiological drives, and incentive theory where external rewards motivate behavior. Maslow's hierarchy of needs proposes humans are motivated to fulfill basic needs before pursuing higher level needs like self-actualization. Understanding human motivation helps nurses recognize patient needs and build relationships to promote healing.