Hair spray is a styling product used to hold hair in place. It comes in an aerosol can or pump bottle and contains polymers that create a thin film over the hair strands. This film helps maintain hairstyles, providing varying levels of hold, from light to strong, depending on the formulation. Typically, hair spray is applied after styling to set the hair and prevent frizz or flyaways. It can also add shine and protect against humidity. Many brands offer different scents and formulations, catering to various hair types and styling needs, making it a popular choice for both everyday use and special occasions.