Reason for the 2 Power Adapters that came with the Macbook?

New macbook owner here. whats the deal with the power adapter? one connection to the wall can simply be latched onto the white square, im sure you know what im talking about. like an ipod wall charger.
the second is the most traditional one when it has a long cable connecting to the wall and then to the white apple square thing.
whats the point of each one? is the longer one for better home and the small connecting one most portable? if this is the case which charges better? no difference? whats the deal? im so confused!

One is used as an extension for the other. I think it shows that in the manual

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