Money laundering involves concealing illegally obtained money to make it appear legitimate. Global money laundering amounts to 2-5% of the worldwide economy. Regulations and laws aim to prevent money laundering through requirements for financial institutions to verify identities, keep records of transactions, and monitor for suspicious activity. Compliance involves costs for financial institutions to set up anti-money laundering systems and train employees. International coordination works to strengthen information sharing and consistent anti-money laundering policies globally.