Criminal law has three main objectives: to protect people, maintain order, and punish criminals. A crime harms society and is prosecuted by the state, not private individuals. For an act to be a crime it must be forbidden by law, cause social harm, and the harm must be serious enough to warrant criminal prosecution. There are different categories of crimes such as offenses against persons or property. The government aims to prevent crime through both reactive measures like law enforcement and proactive strategies targeting social factors linked to criminal behavior. For criminal liability, an act must involve both an unlawful act and criminal intent, and the act must cause harm.