Xylem is a type of vascular tissue that carries water and minerals from the roots to the rest of the plant. It also provides structural support for the plant. Xylem consists of different kinds of cells, such as tracheids, vessel elements, fibers, and parenchyma. Tracheids and vessel elements are the main water-conducting cells, while fibers and parenchyma provide storage and mechanical strength. Xylem can be classified into primary xylem, which is formed by the apical meristem during primary growth, and secondary xylem, which is formed by the vascular cambium during secondary growth.