Bundle data + behavior. ShopNest Product has price and CalculateTax(). Encapsulation hides fields; inheritance/polymorphism let CardPayment and UpiPayment share a charge method.
Hexaware rounds often probe: Automation + full-stack.
Themes commonly reported in public MNC interview experiences (AmbitionBox / LinkedIn / Glassdoor-style). Practice aloud; keep answers this short in the real round.