Digiviso

  Introduction Why MERN stack (MongoDB, Express.js , React, Node.js ) is popular. Importance of MERN in interviews. What recruiters look for: problem-solving, scalability, and full-stack knowledge. Section 1: MongoDB Interview Questions Beginner Level What is MongoDB and why is it used? MongoDB is a NoSQL database that stores data in flexible, JSON-like documents. It is used for its scalability, flexibility, and ease of development compared to traditional SQL databases. Example: Imagine a blog app where each post can have different fields like title, content, tags, and comments. MongoDB allows storing these varied posts without a fixed schema. Difference between SQL and NoSQL databases. SQL databases are relational, use structured tables, and have fixed schemas. NoSQL databases like MongoDB are non-relational, schema-less, and store data in documents or key-value pairs. Example: SQL is like a spreadsheet with fixed columns, while NoSQL is like a collection of JSON files. Explain ...