Tata Consultancy Services interview question

First, introduce yourself. Explain how you solve any Codevita problem. What is encapsulation in object-oriented programming? Explain the concept of inheritance and its importance in OOPs. Explain the importance of constructors and destructors in OOPs. What is a primary key and why is it important in a relational database? What are the ACID properties in database transactions and why are they important? What is the difference between IaaS, PaaS, and SaaS? Explain the difference between public, private, and hybrid clouds.