The role of the cell wall in plant cells is to provide structural support and protection. Made primarily of cellulose, the cell wall maintains the plant's shape, enables it to withstand turgor pressure, and prevents excessive water loss. It also serves as a barrier against pathogens and helps in the transport of materials between cells. In addition, the cell wall plays a role in growth by allowing the plant to expand and elongate as it takes in water. Overall, it is essential for the plant's integrity and function.