These bots, known as "front runners," examine a mempool of pending transactions, taking advantage of the validation period between two blocks on Ethereum to profit from a future huge transaction that would affect the price. One well-known sort of front-running is when a bot makes a buy order ahead of the target transaction at a greater fee to get priority. Then the front-runner places a sell order with a slightly lower fee than the target transaction to sell right after. In short, these front-running bots make the value that the user wants to receive not equal to the real value he will receive. This process is called a "sandwich attack" because the target order is taken between the two orders.

We can also mention various other types of front-running such as the basic front-run, the insertion attack, or the suppression attack. It is good to know that if you use Kromatika to make your trades, you place and pull liquidity to achieve a trade and avoid a traditional swap! So you can also avoid swap fees, front running bots, slippage.