Cell junctions are specialized structures that connect cells to one another, allowing them to communicate and maintain tissue integrity. They play a crucial role in various biological processes, including tissue formation, signaling, and the regulation of substances between cells. There are several types of cell junctions, including tight junctions, adherens junctions, and gap junctions, each serving distinct functions. Tight junctions create a barrier that prevents the passage of materials between cells, while adherens junctions provide mechanical support by linking the cytoskeletons of adjacent cells. Gap junctions, on the other hand, allow for direct communication between cells by enabling the transfer of ions and small molecules. Together, these junctions are essential for maintaining the structure and function of tissues in multicellular organisms.