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Ganesha (Sanskrit: गणेश; IAST: Gaṇeśa; About this sound listen (help·info)), also spelled Ganesa or Ganesh and also known as Ganapati, Vinayaka, and Pillaiyar, is one of the best-known and most widely worshipped deities in the Hindu pantheon. His image is found throughout India. Hindu sects worship him regardless of affiliations. Devotion to Ganesha is widely diffused and extends to Jains, Buddhists, and beyond India.

Although he is known by many other attributes, Ganesha's elephant head makes him easy to identify. Ganesha is widely revered as the Remover of Obstacles and more generally as Lord of Beginnings and Lord of Obstacles (Vighnesha, Vighneshvara), patron of arts and sciences, and the deva of intellect and wisdom. He is honoured at the beginning of rituals and ceremonies and invoked as Patron of Letters during writing sessions. Several texts relate mythological anecdotes associated with his birth and exploits and explain his distinct iconography.

Ganesha emerged a distinct deity in clearly recognizable form in the 4th and 5th centuries CE, during the Gupta Period, although he inherited traits from Vedic and pre-Vedic precursors. His popularity rose quickly, and he was formally included among the five primary deities of Smartism (a Hindu denomination) in the 9th century.

According to Kundalini yoga, Ganesha resides in the first chakra, called Muladhara (mūlādhāra). Mula means "original, main"; adhara means "base, foundation". The muladhara chakra is the principle on which the manifestation or outward expansion of primordial Divine Force rests.