Cell adhesion is the process by which cells are able to stick to one another or to other non-cellular surfaces. This process is crucial for various biological functions such as wound healing, tissue formation, and immune response. Cell adhesion is mediated by specific proteins called adhesion molecules, which are usually located on the cell surface. These molecules bind to receptors on neighboring cells or to the extracellular matrix, providing structural support and facilitating communication between cells. Research in the field of cell adhesion focuses on understanding the mechanisms underlying this process, its regulation, and its implications in various physiological and pathological conditions. This research area has important implications for tissue engineering, regenerative medicine, and cancer biology.