Driving under the influence of alcohol (driving while intoxicated, drunk driving, operating under the influence, drinking and driving, drink-driving, impaired driving) or other drugs, is the act of operating a vehicle (including bicycle, boat, airplane, wheelchair, or tractor) after consuming alcohol or other drugs. Over 1.4 million drivers were arrested for drunk driving in the United States in 2009. Drunk Driving is commonly known as a DUI or DWI. DUI or DWI are synonymous terms that represent the criminal offense of operating (or in some jurisdictions merely being in physical control of) a motor vehicle while being under the influence of alcohol or drugs or a combination of both. It is a criminal offense in most countries. The penalties can be very severe for a conviction. Many states have mandatory fines and some have mandatory jail.

All states have also enacted per se laws that prohibit operating (or in some jurisdictions merely being in physical control of) a motor vehicle while having a specific blood alcohol content (BAC) level. One can be prosecuted under the per se laws whether or not they are actually "impaired" or "under the influence" of alcohol.

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