Varaha is the third avatar of lord Vishnu and this incarnation was in the form of Boar's that has appeared in the Kritya Yuga. Lord Vishnu has taken the form of boar to defeat the asura named Hiramyaksha, who had taken the earth and carried it to the bottom of cosmic ocean.
After defeating Hiramyaksha the asura lord Vishnu lifted the earth by his long front teeth to take it out from the water.
The worshipper of this Shaligram gets immense protection and occult/black magic does not work on him. He is bestowed with good health, knowledge and all his six senses work towards perfection. He get the support of nature in all his endeavors. He get worldly comforts and a peaceful environment throughout his life. Those who are having speculative business can get immense benefit out of worshiping this Shaligram.