Vaults use complex smart contract strategies to automate yield farming, and grow a users assets much faster than traditional yield farming methods. Traditionally a user deposits LP tokens into a yield farm, is rewarded with a reward token, and must harvest/sell the reward tokens to add them back into liquidity pools to auto-compound their investments. Vault smart contract strategies can deposit a users assets, harvest their rewards, trade half and add back to liquidity, at least every 4 hours, increasing the users earning power tremendously.