TYK2, or Tyrosine Kinase 2, is an enzyme that plays a crucial role in the immune system. It is part of the Janus kinase family and helps transmit signals from various cytokines, which are proteins that mediate and regulate immunity and inflammation. By activating specific pathways, TYK2 influences the behavior of immune cells, contributing to the body's response to infections and diseases. Mutations or dysregulation of TYK2 can lead to various health issues, including autoimmune disorders. Research has shown that targeting TYK2 may offer new treatment options for conditions like psoriasis and multiple sclerosis. As a result, TYK2 is an important focus in the development of novel therapies.