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Clinical psychology is  referring to the science, theory and clinical knowledge for the purpose of understanding, preventing, and relieving psychologically-based distress or dysfunction.

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Experimental psychology is work done by those who apply experimental methods to psychological study. . The experimental approach means that tests are administered to participants, with both control and experimental conditions.

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Abnormal psychology is the study of unusual patterns of behaviour, emotion and thought,  which may or may not be understood as precipitating a mental disorder. Although many behaviors could be considered as abnormal, this branch of psychology typically deals with behavior in a clinical context.

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Developmental psychology is the scientific study of how and why human beings change over the course of their life. Originally concerned with infants and children, the field has expanded to include adolescence, adult development, aging, and the entire lifespan.