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Magma, as liquid, preferentially forms in high temperature, low pressure environments within several kilometers of the Earth's surface. Magma compositions may evolve after formation by fractional crystallization, contamination, and magma mixing. By definition rock formed of solidified magma is called igneous rock.
As magma migrates away from the melting zone, it slowly cools off. As it does, more and more solid mineral grains crystallize until eventually all of the melt is gone. Sometimes, magma will get close enough to the surface to feed volcanic eruptions. But most of the time, the magma cools and crystallizes below ground, forming intrusive igneous rocks. Huge masses of igneous rocks are called 'plutons.' When plutons are uplifted during tectonic plate collisions, then eroded by wind and water and ice, they are revealed to us in the rugged topography of the world's mountain ranges.