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For a rock to be classified as an igneous rock it must have been formed by a volcano. So, it could be made out of cooled magma or lava. The different types of igneous rocks are due to different cooling processes. It could have been spewed into the air and cooled on the way down, it could have been underwater and cooled immediately, or it could have oozed out of some crack and cooled slowly. Another way it may have solidified is by a decrease in pressure. For example, being spewed into the air and falling a couple hundred feet.

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Q: What process happens for there to be an igneous rock?
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