In this chapter the properties of supported TiO2 are described in their general aspects. The photocatalytic effect is not illustrated since it is largely explained in Chapter 1. The insights of superhydrophilicity are explained along with its relationship with photocatalytic effect. The antireflection features of TiO2-functionalised glass are briefly treated since they are exhaustively detailed in Chapter 4. Photoprotection towards plastic and anticorrosive protection towards metals are detailed as well. Finally bactericidal effect is deeply analyzed.