The 3 types of bonds are - Covalent, Ionic, and Metallic.
IONIC- Ionic is the bonding between Metal, and non-metal ions. If a positive Ion meets a Negative, they both attract, (opposites attract). It is formed when one atom is transferred to another, because of the way the shells are. An example of a ionic bond would be common house hold salt. Ionic bonds are also very conductive.
COVALENT- In this type of bonding, unlike ionic, a pair of electrons are shared, one comes from each atom. These molecules usually have low melting points, along with low boiling points. This type of bond is usually used in the Lewis Dot Structure. H20 is a common example of a covalent bond. These atoms are also neutral in charge.
METALLIC - The electron sharing in this one is free sharing. Electrons move freely. These are also highly conductive, and have high boiling and melting points. These are also very conductive.
Iron + Carbon is an example of this type of bonding. The metal atoms in this don't lose electrons to form ions.
Sources:
http://www.historyoftheuniverse.com/ionicbon.html
http://www.buzzle.com/articles/metallic-bonding.html
http://www.youtube.com/watch?v=xTx_DWboEVs
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