Nanomaterials are engineered materials with extremely small particle sizes with at least one dimension ranging from one to one hundred nanometers. Nanoscale materials contain unique electrical, magnetic, catalytic, and optical properties that can be applied in various fields, including engineering, medicine, and the environment. Nanomaterials with appealing chemical and physical properties are being researched for potential energy and environmental applications. Nanomaterials have grabbed people's interest due to their ability to enhance efficiency through-beam gap control, chemical composition, structural diagram, light propagation, and charge/transport collection, among other things. Titanium dioxide (TiO2) nanoparticles are mass-produced all over the world for use in a range of applications. TiO2 nanostructured materials have aroused much interest in the energy and environmental sectors due to their future applications in photocatalysis, solar cells, and pollution remediation. Furthermore, because TiO2 nanoparticles are widely available, inexpensive, and non-toxic, they are routinely employed in various products, including cosmetics, where they are used as a UV filter in sunscreens, face creams, foundation, and lipstick. Analgesics. Because of the relevance of titanium dioxide, we will discuss it in this review by demonstrating its characteristics, photocatalysis mechanism, and uses that come into direct contact with human existence.