Poly(1,4-butylene adipate) is primarily used as a biodegradable polymer in various applications. It is commonly employed in the production of compostable plastics, such as packaging materials, agricultural films, and disposable items, where environmental sustainability is a priority. Its biodegradability makes it suitable for single-use products that need to break down naturally in composting environments. Additionally, it is used as a modifier in other polymers to enhance flexibility, toughness, and processing properties, particularly in blends with materials like PLA (polylactic acid) to improve performance in biodegradable products. In the biomedical field, it is explored for use in controlled drug delivery systems and tissue engineering scaffolds due to its biocompatibility and degradation characteristics.