In an online slot game, VI refers to the volatility index, which is a measure of how risky the game is. A high VI means that the game has a higher risk, and therefore the potential for higher payouts. However, it also means that there is a greater chance of losing money. On the other hand, a low VI means that the game is less risky, with lower payouts but a higher chance of winning. Ultimately, the choice between high VI and low VI depends on a player’s risk tolerance and personal preference.