Polyhydroxybutyrate (PHB) is a type of biodegradable plastic produced by certain bacteria as a form of energy storage. It belongs to a class of materials known as polyhydroxyalkanoates (PHAs), which are synthesized from renewable resources. PHB is known for its similar properties to conventional plastics, making it a potential alternative for various applications, including packaging and medical devices. Due to its biodegradability, PHB can break down naturally in the environment, reducing plastic pollution. Researchers are exploring ways to enhance its production efficiency and reduce costs, aiming to make PHB a more viable option for sustainable materials in the future.