Cell junctions are specialized structures that exist between adjacent cells, allowing them to communicate, adhere to each other, and form a barrier to regulate the passage of molecules. These junctions play a crucial role in maintaining tissue integrity, supporting cell signaling, and facilitating cell-to-cell interactions. There are several types of cell junctions, including tight junctions, gap junctions, adherens junctions, and desmosomes, each serving a specific function in cell communication and tissue organization. Research in cell junctions focuses on understanding their molecular structure, function, regulation, and their involvement in various diseases such as cancer, autoimmune disorders, and developmental abnormalities. This research area is important for advancing our knowledge of cellular interactions and tissue homeostasis.