This persuasive essay argues that psychology is an important field of study for several reasons. It describes a dialogue where a friend questions the value of studying psychology, claiming other fields are more important. The writer disagrees, noting that psychology has many branches that are beneficial to society. The writer gives two examples to support their argument: 1) Psychology's main schools of thought provide insights into brain function, behavior, and how people think and act, which is helpful for understanding others. 2) Psychology has provided tools that can be applied in the real world.