Blow molding is a manufacturing process used to create hollow plastic parts. It involves heating a plastic material until it becomes pliable, then forming it into a tube called a parison. This parison is inflated with air inside a mold, allowing it to take the shape of the mold cavity. This technique is commonly used to produce items like bottles and containers. There are several types of blow molding, including extrusion blow molding and injection blow molding. Each method has its own advantages and is chosen based on the specific requirements of the product being made. The process is efficient and can produce large quantities of items quickly.