Question about the Power adapter

I just got my Macbook and I love it but I'm a bit confused as to the function of the power adapter. I plugged it in and it started to charge my battery. Is this supposed to happen? I thought the function of the adapter was to provide continuous power from an outlet supply. Maybe I'm under the impression that the second cord I received with my macbook is a power supply cord. Is it?

Also You can run the computer without your battery in but I believe it's not good for the computer.
This link explains the point you were making. MacBook reduces processor speed when battery is removed while operating from an A/C adaptor

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