When you submit a transaction, it sits in the public mempool before it is mined, visible to everyone. Bots watch that mempool and reorder, insert, or sandwich transactions to extract value. This is MEV, and if you write a contract without thinking about it, you are leaving money on the table fo...
Source: [Dev.to](https://dev.to/pavelespitia/front-running-and-mev-writing-contracts-that-dont-leak-money-to-the-mempool-5fe3)