Tellurite is a chemical compound that contains the element tellurium in its anionic form, typically represented as TeO3^2-. It is often found in the form of tellurite salts, such as sodium tellurite, which are used in various applications, including microbiology and as a selective agent in culture media. In addition to its uses in laboratories, tellurite can also be involved in the production of certain types of glass and ceramics. Its unique properties make it valuable in research and industrial processes, particularly in the fields of materials science and chemistry.