Resonance Structures

Resonance structures show the different ways in which bonding structures can be shown. In reality, all of the possible resonance structures are put together in the actual molecule. As shown in the picture below, this bonded molecule can be shown in these possible ways, even though it is essentially the same thing.

https://www.khanacademy.org/science/organic-chemistry/organic-structures/formal-charge-resonance/v/resonance-intro-jay
http://preparatorychemistry.com/Bishop_Resonance.htm