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Atoms can be excited
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Light interacts with matter in many ways. For one thing, any material object -- even a gas -- can emit light if it gets hot enough. (An electric bulb shines because a tiny metal wire in it is heated to a temperature of several thousand degrees!) Also, matter can absorb light (that's why you can hide behind a tree -- the light coming from you gets absorbed by the tree so no one on the other side can see you). The ability of atoms to emit and absorb light has a lot to do with their ability to store energy and then re-emit it at a later time. When an atom stores energy it goes into an excited state and when it releases that energy it goes back into the ground state.
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