The opioid crisis refers to the widespread epidemic of addiction, misuse, and overdose deaths involving opioid drugs. These drugs include prescription painkillers like oxycodone and hydrocodone, as well as illegal opioids such as heroin and fentanyl. The crisis began in the late 1990s when increased prescription of opioid medications led to widespread misuse. Many individuals developed dependencies, and as regulations tightened, some turned to illicit opioids. The crisis has had devastating effects on public health, contributing to hundreds of thousands of deaths and straining healthcare, social services, and law enforcement systems. Efforts to address the crisis include improving prescribing practices, expanding treatment for addiction, and increasing public awareness.