If you’re stepping into full-stack development, chances are you’ve heard of the **MERN stack**. It’s one of the most popular technology stacks today, powering everything from small projects to enterprise-level applications. But how do these four technologies fit together? Let’s break it down step by step. --- ### 🔹 The Four Pillars of MERN 1. MongoDB (Database Layer) - A NoSQL database that stores data in flexible, JSON-like documents. - Perfect for handling dynamic, unstructured data. - Example: A user profile `{ name: "John", age: 25 }` is stored as a document in MongoDB. 2. Express.js (Backend Framework) - A lightweight framework built on Node.js. - Handles HTTP requests, routes, and middleware. - Example: When a user submits a form, Express processes the request and decides what to do with the data. ...