One of the most influential and widely used theories of motivation is the self-determination theory (SDT). According to SDT, motivation is not a fixed trait, but a dynamic and multidimensional phenomenon that depends on the interaction between the individual and the environment. SDT proposes that there are three basic psychological needs that affect motivation: autonomy, competence, and relatedness. Autonomy refers to the sense of choice and control over one's actions. Competence refers to the sense of mastery and effectiveness in achieving one's goals. Relatedness refers to the sense of belonging and connection with others. When these needs are satisfied, students experience intrinsic motivation, which is the highest and most desirable form of motivation. Intrinsic motivation means doing something for its own sake, out of interest and enjoyment. When these needs are thwarted, students experience extrinsic motivation, which is the lower and less desirable form of motivation. Extrinsic motivation means doing something for external reasons, such as rewards, praise, or pressure.