Tree roots are the underground parts of a tree that anchor it to the soil. They absorb water and nutrients from the ground, which are essential for the tree's growth and health. Roots can spread out widely, sometimes extending far beyond the tree's branches, and they help prevent soil erosion by holding the soil in place. There are different types of tree roots, including taproots, which grow deep into the ground, and fibrous roots, which spread out near the surface. The structure and depth of roots can vary depending on the tree species and the type of soil in which they grow.