Here's why:

* Covalent bonds: In covalent bonds, atoms share electrons to achieve a stable electron configuration (usually a full outer shell). This sharing creates a strong attraction between the atoms, holding them together.

* Nonmetals: Covalent compounds are typically formed between nonmetals. Nonmetals have a strong tendency to gain electrons and become negatively charged.

* Examples: Water (H₂O), carbon dioxide (CO₂), methane (CH₄), and many organic molecules are all examples of covalent compounds.

Let me know if you'd like more details on covalent bonding or any specific examples!