Motivation is an important concept in modern psychology. It is not possible to understand, explain or predict human behavior without some knowledge of motivation. Motivation is the effective methods that relate to an individual 's intensity, route and determination of effort towards the achievement of goals. Motivation is the process of producing and maintaining goal-directed behavior. Motivation is a psychological process through which unsatisfied wants or needs leads to drives that is aimed at goals or incentives. Sources of motivation are categorized into two groups: extrinsic motivators and intrinsic motivators. Behavior that is performed for its own sake is intrinsically motivated and behavior that is performed to acquire material or social rewards or to avoid punishment is extrinsically motivated.