Mylar is a type of polyester film known for its strength, durability, and versatility. It is often used in packaging, insulation, and various industrial applications due to its resistance to moisture and chemicals. Mylar can also be found in balloons, where it is popular for its shiny appearance and ability to hold helium. Originally developed in the 1950s, Mylar is a brand name for a specific type of polyethylene terephthalate (PET) film. It is available in different thicknesses and finishes, making it suitable for a wide range of uses, from craft projects to electronic components.