Money laundering involves converting illegally obtained "dirty money" into money that appears legitimate. It typically involves three stages: placement, layering, and integration. Common techniques include using shell companies, offshore tax havens, smurfing, and real estate transactions. Legislation like India's PMLA and international cooperation aim to detect and prevent money laundering, which enables criminal activities and undermines the financial system. Red flags that could indicate money laundering include suspicious fund transfers, inconsistent business activities, and dubious offshore companies.