A covalent bond is a force between two or more atoms that holds them together. The bond is provided by electrons that travel between the atom's nuclei, holding them together. In biology the covalent bonds are called strong bonds, because they are normally not broken under biological conditions unless an enzyme catalyst is present. There is a type of covalent bond called a polar covalent bond, which are important since these bonds allow the formation of another kind of weak bond called a hydrogen bond. Water is an example of a polar covalent bond, which is why I took a picture of this water bottle to represent the covalent bond.
Source:
Covalent Bonds (December 12, 2006).
biology-online.org. Retrieved on August 31, 2011, from
http://www.biology-online.org/dictionary/Covalent_bonds
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