PMMA, or polymethyl methacrylate, is a synthetic polymer commonly used as a lightweight and shatter-resistant alternative to glass. It is often found in products like lenses, displays, and signage due to its clarity and durability. PMMA can be easily molded and shaped, making it versatile for various applications. This material is also known for its excellent weather resistance, which allows it to be used in outdoor settings without significant degradation. Additionally, PMMA is used in the medical field for items such as dental prosthetics and intraocular lenses, showcasing its adaptability across different industries.