Ethyl 4-diethylaminobenzoate is primarily used as a UV absorber in various industrial and consumer products. It is commonly incorporated into sunscreens and cosmetic formulations to protect the skin from harmful ultraviolet radiation by absorbing UV-B rays. Additionally, it finds application in the production of plastics and coatings, where it acts as a stabilizer to prevent degradation caused by UV exposure. In the field of photography, it is utilized as a sensitizer in certain photographic emulsions to enhance light sensitivity. Its ability to absorb UV light also makes it suitable for use in optical materials and films to improve durability and performance under sunlight.