Here's why:

* Covalent bonds form when two atoms share electrons to achieve a stable electron configuration.

* Carbon and sulfur both have a moderate electronegativity, meaning they have a similar tendency to attract electrons.

* This similarity in electronegativity prevents one atom from completely taking electrons from the other, leading to the sharing of electrons in a covalent bond.

The specific type of covalent bond between carbon and sulfur can vary depending on the molecule. It can be a single, double, or even triple bond, depending on the number of electrons shared.