The vascular cambium is a layer of tissue in plants that plays a crucial role in secondary growth. It is located between the xylem and phloem, two types of vascular tissue responsible for transporting water, nutrients, and sugars. The cambium produces new cells, allowing the plant to increase in diameter over time, which is essential for the structural support of larger plants and trees. This tissue is particularly important in woody plants, such as trees and shrubs, where it contributes to the formation of annual growth rings. Each year, the cambium generates new layers of xylem and phloem, which helps the plant adapt to its environment and maintain its health as it ages.