Psychology is the scientific study of behavior and mental processes.
In other words, psychologists study everything that we do, think, and feel. The modern field of psychology emphasizes the scientific approach to studying behavior, thought, and emotion. Therefore, just as a physicist might study the path of an electron, or a biologist might study the processes of gene expression, a psychologist would use scientific methods to study why, for example, some people are more anxious than others, or why people become addicted to cocaine. As you can imagine, psychologists are involved in a wide range of studies. Some researchers are looking at the processes that account for our memory, while others study such things as the genetics of alcoholism, the social influences on sexual behavior, neural bases of learning and memory, why some people are absent from work more often than others, possible cultural influences on learning, or how best to treat a child who has autism.