Ethyl 4-hydroxybenzoate is widely used as a preservative in cosmetics, personal care products, and pharmaceuticals due to its antimicrobial properties. It helps prevent the growth of bacteria, fungi, and yeast, extending the shelf life of these products. In the food industry, it is employed as a food additive to inhibit spoilage and maintain freshness in items like baked goods, beverages, and processed foods. Additionally, it is utilized in topical medications and creams to ensure stability and prevent contamination. Its effectiveness at low concentrations makes it a popular choice for preserving a wide range of products.