The main difference between these two is their purpose.

Tree trimming is primarily for aesthetic purposes. The tree’s leaves are cut or trim to achieve the desired shape on the tree's appearance. If a tree's leaves and branches are left unchecked, it can quickly grow out randomly in different directions. This uncontrolled growth can make the tree appear imbalanced, ugly, or unhealthy. A wildly growing tree also poses a hazard to any other plants near it. It can steal and prevent them from getting the moisture or light that they need to survive.

Tree trimming also includes shrubs and hedges to have a more professional look. Business owners usually do this to give their commercial establishments a cleaner look and are more attractive to potential customers.

On the other hand, tree pruning also helps with aesthetics, but the primary goal is to keep the tree healthy.

Tree pruning’s primary goal is to remove any dead or diseased branch to stop it from harming the tree. This technique promotes better growth for the tree. It also helps prevent any pests from thriving in dead branches. Pruning also takes care of any tree parts that may interfere with an adjoining plant, like branches crossing over to another tree.

Proper pruning can promote flower production, but if done improperly, you may do more harm than good and stunt your tree’s overall growth.