Ganesha is one of the most easily recognizable Gods from any religion, because he has the head of an elephant. This elephant-headed God appears very widely throughout all Hindu traditions. On that note let me re-emphasize once again that Hinduism is not a single religion, it is a very wide collection of faiths. The true name for Hinduism is Dharma, which means "truth."
Ganesha is one of the "Gods" known throughout Asia, and is becoming known in the West. He has many, names and symbols, and a great deal of importance and emphasis in the traditions of Asia, not just in India but also in China and Japan