The structure of TiO2 is an excellent aspect to consider when reviewing a product. TiO2 can be found in various forms, including nanoparticles and bulk materials. Its crystalline structure plays a crucial role in determining the product's performance. A well-structured TiO2 product ensures higher efficiency and enhanced photocatalytic activities. It also offers improved stability and durability. The crystal size and morphology greatly impact the product's optical and photocatalytic properties. Therefore, when purchasing a TiO2-based product, it is crucial to choose one with a well-defined and controlled structure to gain all the benefits it offers.