Lymph nodes are small, bean-shaped structures found throughout the body that play a crucial role in the immune system. They filter and trap pathogens, such as bacteria and viruses, as well as damaged cells and other foreign substances, helping to activate the immune response to fight off infection and disease. Research on lymph nodes focuses on understanding their structure, function, and role in various diseases, such as cancer, autoimmune disorders, and infectious diseases. This research aims to develop new treatments and diagnostic tools to target and manipulate lymph nodes for therapeutic purposes and improve our overall understanding of the immune system.