Hinduism originated in the area now called India and is still practiced by more than 80% of its inhabitants. Hinduism is considered a major world religion because of its approximately 700 million believers and its has influence on many other religions during its long history. Some authorities date it back to about 1500 BC and consider it the oldest religion in the world. This religion cannot be traced to a specific founder and does not have only one "holy book" as a spiritual guide. Unlike most other religions, Hinduism does not promote the worship of one particular deity. A Hindu may worship one or many different manifestations of the divine.
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Ganesh, often also referred to as Ganapati, is one of the most well-known and venerated representations of God in Hinduism. He is the son of Shiva and Parvati, and the 'consort' of Buddhi (also called Riddhi) and Siddhi. 'Ga' symbolizes Buddhi (intellect) and 'Na' symbolizes Vidnyana (wisdom). Ganesha is thus considered the master of intellect and wisdom.
Here are some more interesting links about Lord Ganesh.
Here is a prayer to Lord Ganesh: