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