Optiver is a global market maker that provides liquidity in financial markets, allowing assets to be bought and sold easily without affecting their prices. They serve institutional clients like banks and hedge funds by offering competitive prices for various financial instruments, including stocks and derivatives. Using advanced technology and proprietary trading strategies, Optiver captures profits from the small differences between buying and selling prices, contributing to market stability. Their goal is to enhance the efficiency and fairness of financial markets while effectively serving their clients.