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How do Vishnu’s avatars defend dharma in Hindu tradition?

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Painting depicting Hindu gods Shiva, Vishnu, and Brahma with Ganesha standing and paying homage to Mahadevi, who is seated on a lotus and playing a stringed instrument. — Hinduism Shiva, Vishnu, and Brahma (left to right) pay homage to Mahadevi (the great goddess, in white in the form of Saraswati), attended by the elephant-headed deity Ganesha, in a painting dated c. 1750.

In Hindu tradition, Vishnu—the preserver deity—descends to Earth in various forms known as avatars to uphold dharma, the moral and religious law that governs cosmic and individual order.123

These incarnations serve to restore balance by empowering the good and destroying evil. As described in the Bhagavad Gita, Vishnu manifests in different ages whenever there is a decline in righteousness and a rise in unrighteousness, specifically to protect the virtuous, eliminate the wicked, and establish dharma.2

The methods used by these avatars vary according to the needs of the time:
* Direct Intervention: Avatars often engage in battle to defeat demonic forces that threaten the world, such as Rama slaying the demon Ravana or Narasimha destroying the tyrant Hiranyakashipu.2
* Cosmic Preservation: Some avatars, like Matsya and Kurma, act to preserve life or stabilize the universe during times of great crisis.2
* Moral Guidance: Through figures like Krishna, Vishnu provides spiritual and ethical instruction, teaching individuals to perform their prescribed duties without selfish attachment to the results.245

Ultimately, these descents are believed to relieve the burden of the Earth and ensure the continuity of cosmic order.2