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There are a number of different gases for diving.
Most commonly, air is used for recreational diving. Sometimes, nitrox is used which is a higher proportion of oxygen. This is usually 30-35% oxygen instead of the ~20% in air. This has the benefit of less nitrogen so less "on-gassing". This increases the bottom time and reduces the decompression stops.
For commercial diving, there are a number of other gases used such as Trimix which I believe has Helium in it.
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