Driving While Intoxicated, often abbreviated as DWI, refers to operating a vehicle while under the influence of alcohol or drugs. This impairment can significantly affect a person's ability to drive safely, leading to slower reaction times, poor judgment, and decreased coordination. Laws regarding DWI vary by location, but generally, a blood alcohol concentration (BAC) of 0.08% or higher is considered illegal for drivers over the age of 21 in many places. Penalties for DWI can include fines, license suspension, and even jail time, depending on the severity of the offense and any prior convictions.