Blow molding is a manufacturing process used to create hollow plastic parts. It involves heating a thermoplastic material until it becomes pliable, then forming it into a tube called a parison. This parison is inflated with air inside a mold, causing it to expand and take the shape of the mold cavity. Once cooled, the mold is opened, and the finished product is removed. This technique is commonly used to produce items like bottles, containers, and automotive parts. Blow molding is efficient and cost-effective, making it a popular choice in the plastic manufacturing industry for creating large quantities of uniform products.