What is Call Stack in JavaScript?

📚 What is Call Stack in JavaScript? (Explained Simply) The Call Stack is where JavaScript executes your code. It is a data structure that follows one simple rule: 👉 Last In, First Out (LIFO) The last function added to the stack runs first. 🧠 How Call Stack Works When a function is called: It gets pushed into the Call Stack. JavaScript executes it. After completion, it gets removed (popped). JavaScript can only execute one thing at a time, so it uses the Call Stack to manage everything. 💻 Example function first () { console . log ( " First " ); } function second () { first (); console . log ( " Second " ); } second (); 🔎 What Happens Internally? second() is pushed into stack. Inside it, first() is pushed. first() runs and is removed. Then second() continues. 🍽 Simple Real-Life Example Imagine a stack of books. You always place a book on top. You always remove the top book first. That’s exactly how Call Stack behaves. 🎯 Important Interview Point The Call Stack works on: Last In, First Ou