The extracellular matrix (ECM) is a complex network of proteins and polysaccharides that provides structural and biochemical support to cells and tissues. It plays a critical role in regulating cell behavior, tissue development, and homeostasis. The ECM is composed of various macromolecules, including collagens, proteoglycans, and fibronectin, which assemble into specific structures that reflect and facilitate the functional needs of the tissue. The assembly of the ECM is a dynamic process involving multiple stages, including the synthesis, modification, and cross-linking of ECM components. The unique properties of the ECM are determined by the composition, organization, and interactions of its components, which can vary significantly between different tissues. The ECM not only provides mechanical support but also serves as a source of biochemical signals that influence cell behavior. Understanding the assembly and regulation of the ECM is essential for elucidating the mechanisms underlying tissue development, disease, and regeneration. This review provides an overview of the structural principles and molecular components involved in ECM assembly, highlighting the key roles of various ECM molecules in tissue-specific functions. The review also discusses the importance of ECM organization in maintaining tissue homeostasis and the potential implications of ECM dysfunction in disease. The ECM is a dynamic and complex structure that is essential for the proper functioning of tissues and organs.The extracellular matrix (ECM) is a complex network of proteins and polysaccharides that provides structural and biochemical support to cells and tissues. It plays a critical role in regulating cell behavior, tissue development, and homeostasis. The ECM is composed of various macromolecules, including collagens, proteoglycans, and fibronectin, which assemble into specific structures that reflect and facilitate the functional needs of the tissue. The assembly of the ECM is a dynamic process involving multiple stages, including the synthesis, modification, and cross-linking of ECM components. The unique properties of the ECM are determined by the composition, organization, and interactions of its components, which can vary significantly between different tissues. The ECM not only provides mechanical support but also serves as a source of biochemical signals that influence cell behavior. Understanding the assembly and regulation of the ECM is essential for elucidating the mechanisms underlying tissue development, disease, and regeneration. This review provides an overview of the structural principles and molecular components involved in ECM assembly, highlighting the key roles of various ECM molecules in tissue-specific functions. The review also discusses the importance of ECM organization in maintaining tissue homeostasis and the potential implications of ECM dysfunction in disease. The ECM is a dynamic and complex structure that is essential for the proper functioning of tissues and organs.