Indra is a Vedic deity in Hinduism, a guardian deity in Buddhism, and the king of first heaven called Saudharmakalpa in Jainism. His mythologies and powers are similar, though not identical to those of the Indo-European deities such as Zeus, Jupiter, Perun, Thor, and Odin (Wotan).
In the Vedas, Indra is the king of Svarga (Heaven) and the Devas. He is the god of lightning, thunder, storms, rains and river flows.Indra is the most referred to deity in the Rigveda. He is celebrated for his powers, and the one who kills the great symbolic evil named Vritra who obstructs human prosperity and happiness. Indra destroys Vritra and his “deceiving forces”, and thereby brings rains and the sunshine as the friend of mankind. His importance diminishes in the post-Vedic Indian literature where he is depicted as a powerful hero but one who is getting in trouble with his drunken, hedonistic and adulterous ways, and the god who disturbs Hindu monks as they meditate because he fears self-realized human beings may become more powerful than him.
In Buddhism, Indra has been a popular deity, referred by many names and particularly Shakra (Pali: Sakka). He is featured in Buddhism somewhat differently than Hinduism, such as being shown as less war oriented and one paying homage to the Buddha. Indra rules over the much sought Devas realm of rebirth within the Samsara doctrine of Buddhist traditions. However, like the Hindu texts, Indra also is a subject of ridicule and reduced to a figurehead status in Buddhist texts. In the Jainism traditions, like Buddhism and Hinduism, Indra is the king of gods and a part of Jain rebirth cosmology.He is also the god who appears with his wife Indrani to celebrate the auspicious moments in the life of a Jain Tirthankara, an iconography that suggests the king and queen of gods reverentially marking the spiritual journey of a Jina.