Polyethylene is a widely used plastic made from the polymerization of ethylene, a simple hydrocarbon. It is known for its versatility, durability, and resistance to moisture, making it suitable for various applications, including packaging, containers, and plastic bags. There are different types of polyethylene, such as low-density polyethylene (LDPE) and high-density polyethylene (HDPE), each with unique properties. LDPE is flexible and used for items like plastic wraps, while HDPE is more rigid and commonly used for bottles and piping. Its recyclability also contributes to its popularity in sustainable practices.