Adhesion molecules are proteins located on the surfaces of cells that facilitate their binding to other cells or to the extracellular matrix. These molecules play a crucial role in various biological processes, including tissue formation, immune response, and wound healing. Examples of adhesion molecules include integrins, cadherins, and selectins. These molecules help maintain the structure and integrity of tissues by promoting cell-to-cell interactions and communication. They are essential for processes like embryonic development and inflammation, where cells need to move and adhere to specific locations. Dysfunction in adhesion molecules can lead to various diseases, including cancer and autoimmune disorders.