Lateral meristem is a type of plant tissue responsible for secondary growth, which increases the thickness of stems and roots. It is found in two main forms: the cork cambium, which produces bark, and the vascular cambium, which generates new xylem and phloem cells. This growth allows plants to support larger structures and transport nutrients more efficiently. Unlike apical meristems, which promote vertical growth, lateral meristems enable plants to expand outward. This process is crucial for woody plants, such as trees, as it helps them develop a sturdy trunk and branches, enhancing their ability to withstand environmental stresses.