An arbitrageur is a trader or investor who seeks to profit from price discrepancies in different markets. By buying an asset in one market at a lower price and simultaneously selling it in another market at a higher price, they can capitalize on the difference. This practice helps to ensure that prices remain consistent across markets. Arbitrageurs often deal with various financial instruments, including stocks, currencies, and commodities. Their activities contribute to market efficiency, as they help align prices and reduce the chances of significant price differences. This process is essential for maintaining a balanced and fair trading environment in the financial world.