Transition metal dichalcogenides (TMDs) are a class of materials that consist of transition metal atoms sandwiched between two layers of chalcogen atoms (e.g. sulfur, selenium, or tellurium). These materials have unique properties that make them attractive for a wide range of applications, including electronics, catalysis, and energy storage. TMDs have a layered structure similar to graphene, with strong covalent bonds within each layer and weaker van der Waals interactions between the layers. This arrangement gives TMDs unique mechanical and electronic properties, such as tunable band gaps, high carrier mobilities, and strong light-matter interactions. Research on TMDs has focused on exploring their potential for applications in various fields, including optoelectronics, photovoltaics, and sensing. Researchers are also investigating the use of TMDs in novel devices such as transistors, photodetectors, and batteries. Overall, transition metal dichalcogenides have the potential to revolutionize technology by enabling the development of smaller, faster, and more efficient electronic devices.