Schizophrenia is a chronic and severe mental disorder that affects how an individual thinks, feels, and behaves. It is characterized by symptoms such as hallucinations (hearing or seeing things that are not there), delusions (false beliefs), disorganized thinking, and impaired social functioning. The exact cause of schizophrenia is unknown, but it is believed to involve a combination of genetic, environmental, and neurobiological factors. Treatment typically involves medication, psychotherapy, and support for the individual and their family.