What is the difference between anabolism and catabolism?

Metabolism, which is the set of all biochemical reactions in a cell or body, is comprised of both anabolism and catabolism.

Anabolism comprises of constructive reactions involved in synthesizing complex molecules. Anabolic reactions are endergonic and require energy to occur. On the other hand, catabolism includes all the destructive reactions involved in the breaking down of complex molecules. Catabolic reactions are exergonic and release energy.