The Columbine tragedy refers to a school shooting that occurred at Columbine High School in Littleton, Colorado on April 20, 1999. Two senior students, Eric Harris and Dylan Klebold, entered the school and opened fire, killing 12 students and 1 teacher. It was one of the deadliest school massacres in U.S. history. The shooting sparked national debate around bullying, gun laws, and violence in schools and society. Twenty years later, the tragedy is still remembered as a defining moment in the discussion around school safety and youth mental health issues.