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The animation shows the circuit diagram of a flashlight.
When the flashlight is turned on (the switch is "closed" in electronic speak), the
extra electrons available at the negative side of the battery now have a path to
the positive side of the battery
where the battery needs electrons.
A circuit with no path for electrons to travel is called an "open circuit".
A word about batteries: Batteries are an electro chemical device. That is to say that due to the action of several chemicals inside of a battery a surplus of electrons are available at the negative side and a lack of electrons exists at the positive end.
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