ICSE Class 10 Answered

The ability of carbon to make four covalent bonds with four other carbon atoms or with various elements is required for the production of complex organic molecules such as hydrocarbons, polymers, and many other organic compounds. Because of its propensity to interact with itself and other elements in a variety of ways, organic molecules discovered in nature and synthesised by chemists are extremely diverse.

To summarise, carbon's tetravalency is a basic property that allows catenation, or the production of long chains or networks of carbon atoms in organic molecules.