What is the main purpose of using headlights during the day?

Using headlights during the day primarily serves to increase visibility to other drivers. This practice significantly enhances safety by making your vehicle more noticeable, particularly in conditions where it might otherwise blend into the background, such as on overcast days, in rain, or when driving through wooded areas. Daytime running lights can help reduce the risk of accidents by ensuring that other road users can see you well in advance, thus allowing for safer interactions on the road. While there may be legal compliance in certain regions that governs the use of headlights, the primary reason is the safety benefit derived from increased visibility.