Which product is commonly used in hair styling and contains ethyl alcohol?

The commonly used product in hair styling that contains ethyl alcohol is hairspray. Hairspray is designed to provide a hold for hairstyles while allowing for flexibility and movement. The inclusion of ethyl alcohol helps to quickly evaporate moisture, allowing the product to dry rapidly and thus hold the hair in place effectively. This makes it a popular choice for finishing styles, as it enhances texture and control.

In contrast, shampoo primarily focuses on cleansing the hair and scalp, while conditioner is intended to moisturize and detangle. Hair gel is often used to style and sculpt hair but typically contains other types of alcohol or ingredients designed for hold and texture, rather than ethyl alcohol specifically. Therefore, in the context of the question, hairspray is the most appropriate answer due to its formulation and intended use in styling.