What are Global Variables? How are These Variables Declared? | JavaScript Interview Questions #code

Ever wondered what global variables are and why they’re talked about so much in coding interviews and best practices?
In this beginner-friendly explanation, we break down everything you need to know about global variables in JavaScript —
how to declare them, when (or when not) to use them, and the common problems they can create in real-world applications.

Learn:
🔹 What is a global variable in JavaScript?
🔹 How to declare global variables using var, let, and const
🔹 Common issues: name collisions, accidental overrides, debugging nightmares
🔹 Best practices and tips to avoid global scope pollution

📌 Perfect for students, frontend developers, and interview preparation
📌 Simple explanation with examples you can understand in seconds
📌 Great for clearing core JavaScript concepts

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