The document discusses different types of violence that can occur in schools, including bullying and violence between teachers and students. It describes bullying as intentional, repetitive acts of physical or psychological aggression by one person or group against a victim. Bullying can be direct through physical means or indirect through social aggression and isolation. The document also notes that violence against teachers by students has been increasing, though many cases go unreported due to teachers feeling ashamed, fearing reprisal, or believing the legal process takes too long.