Schizophrenia is a severe mental disorder characterized by delusions, hallucinations, and other cognitive difficulties. It typically develops between ages 16-30 and affects about 1% of the population worldwide. Symptoms are divided into positive symptoms like hallucinations and delusions, and negative symptoms like reduced pleasure and speaking. Diagnosis requires at least two symptoms for over a month along with impairment and ruling out other conditions. Treatment involves medication, counseling, and self-help resources to manage the lifelong impacts.