Cashflow Quadrant by Robert Kiyosaki explores the four types of people who make up the world of money: Employees (E), Self-Employed (S), Business Owners (B), and Investors (I). Kiyosaki introduces the concept of the “Cashflow Quadrant” to explain how each group generates income and the mindset shifts required to move from one quadrant to another. The book emphasizes the importance of financial education and encourages readers to transition from being an employee or self-employed to becoming a business owner or investor for greater financial freedom.