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A sigma bond is the end-to-end overlap of the bonding orbitals, usually hybrid orbitals. The sigma bond is a single bond. A pi bond is the side-to-side overlap of unhybridized p-orbitals. A pi bond, along with a sigma bond form a double bond. sigma bond is used in hybridization but pi bond when dealing with saturated molecules is not used,that is double bonds.The oygen molecule is sp hybridized have you ever reasoned or found out why.
This kind of bond is called a pi bond. The pi bond results when p orbitals overlap one another in this side-to-side fashion. This diagram tries to represent all of the sigma and pi bonds in ethene (C2H4).