Covalent bonds form between non-metals. Non-metals are elements that have a high electronegativity, meaning they have a strong attraction to electrons. When two non-metals bond, they share electrons between them in order to achieve a more stable electron configuration. This sharing of electrons creates a covalent bond.

Some common examples of covalent bonds include:

- Hydrogen-hydrogen bond (H-H)

- Carbon-carbon bond (C-C)

- Oxygen-oxygen bond (O-O)

- Nitrogen-nitrogen bond (N-N)

- Fluorine-fluorine bond (F-F)

- Chlorine-chlorine bond (Cl-Cl)

Covalent bonds are also found in many organic compounds, which are compounds that contain carbon. Carbon is a non-metal that can form covalent bonds with other non-metals, such as hydrogen, oxygen, and nitrogen. This versatility allows carbon to form a wide variety of different organic compounds, including proteins, carbohydrates, and fats.