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Indra, also known as Sakra in the Vedas, is the leader of the Devas or gods and the lord of Svargaloka or heaven in the Hindureligion. He is the god of rain and thunderstorms.^[1] He wields a lightning thunderbolt known as vajra and rides on a white elephantknown as Airavata. Indra is the supreme deity and is the twin brother of Agni and is also mentioned as an ?ditya, son of Aditi. His home is situated on Mount Meru in the heaven.^[2] He has many epithets, notably v??an the bull, and v?trahan, slayer of V?tra,Meghavahana "the one who rides the clouds" and Devapati "the lord of gods or devas".^[2] Indra appears as the name of a daeva inZoroastrianism (but please note that word Indra can be used in general sense as a leader, either of devatas or asuras^[3]), while his epithet, Verethragna, appears as a god of victory. Indra is also called ?akra frequently in the Vedas and in Buddhism (Pali: Sakka). He is known in Burmese as ??????????, pronounced: [ðad?á m???]; in Thai as ????????? Phra In, in Malay as Indera, in Teluguas ???????? Indrudu, in Tamil as ???????? Inthiran, Chinese as ??? Dìshìti?n, and in Japanese as ??? Taishakuten.^[4] He is celebrated as a demiurge who pushes up the sky, releases Ushas (dawn) from the Vala cave, and slays V?tra; both latter actions are central to the Soma sacrifice. He is associated with Vajrapani - the Chief Dharmapala or Defender and Protector of the Buddha,Dharma and Sangha who embodies the power of the Five Dhyani Buddhas. On the other hand, he also commits many kinds of mischief (kilbi?a) for which he is sometimes punished. In Puranic mythology, Indra is bestowed with a heroic and almost brash and amorous character at times, even as his reputation and role diminished in later Hinduism with the rise of the Trimurti. 

 http://en.wikipedia.org/wiki/Indra