Here's why:

* Sharing Electrons: Covalent bonds occur when two atoms share one or more pairs of electrons. This sharing helps both atoms achieve a stable electron configuration (usually resembling a noble gas).

* Nonmetals: Covalent bonds are most common between nonmetal atoms.

* Types of Covalent Bonds: There are different types of covalent bonds, including single, double, and triple bonds, depending on the number of electron pairs shared.

Example:

* In the water molecule (H₂O), oxygen (O) shares two electrons with each hydrogen (H) atom, forming two single covalent bonds.