Easy-level backend interview questions covering HTTP, REST APIs, databases, and server fundamentals. Q1: What is REST and what are its principles? Answer: graph TB A[REST<br/>Representational State Transfer] --> B[Stateless<br/>No session state] A --> C[Client-Server<br/>Separation] A --> D[Cacheable<br/>Responses] A …

Entity Relationship Diagrams (ERD) visualize database schemas, showing entities, their attributes, and relationships. Perfect for database design and documentation. Use Case Use ER diagrams when you need to: Design database schemas Document database structure Show relationships between entities Visualize data models …