And out of the 10 avatars of Lord Vishnu, with one yet to arrive, there are 7 that are considered ever so important and powerful. Here we mention 7 iconic avatars of Lord Vishnu and what their purpose on Earth was.And out of the 10 avatars of Lord Vishnu, with one yet to arrive, there are 7 that are considered ever so important and powerful. Here we mention 7 iconic avatars of Lord Vishnu and what their purpose on Earth was.