Terephthalic acid is a colorless, crystalline organic compound primarily used in the production of polyethylene terephthalate (PET), a widely used plastic. It is produced through the oxidation of p-xylene and is an important raw material in the manufacture of fibers, films, and containers. This compound is known for its durability and resistance to chemicals, making it suitable for various applications, including textiles and packaging. Terephthalic acid is also a key component in the production of polyester, which is commonly used in clothing and home furnishings.