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Ever wondered how JavaScript actually runs inside your browser? This video breaks down the entire JavaScript Runtime Environment and explains the execution process step by step, with real-world relevance — from browsers and mobile apps to smartwatches, blockchain, and AI/ML systems. Whiteboard File:- https://www.tldraw.com/f/iiXeRaxNYY0R... Source-Codes:- https://github.com/Aestheticsuraj234/... 🧠 Topics Covered: 🚀 What is the JavaScript Runtime Environment? 📦 JS Engine + External Web APIs + Event Loop + Queues ⚙️ How the JS Engine works (written in low-level languages) 🔁 From Code Input → Parsing → Compilation → Execution 🧱 Tokenization, Syntax Parser, AST (Abstract Syntax Tree) 🧠 Interpreter, JIT Compiler (Ignition + TurboFan), Bytecode 📊 Memory Heap, Call Stack, Callback Queue, Microtask Queue 🕒 setTimeout, console, WebStorage APIs in runtime 📱 JS running in browsers, mobile, watches, blockchain & AI apps 💡 Key Concepts Explained: Interpreter vs Compiler (hybrid approach) Optimized Machine Code Generation How let a = 10; becomes machine instructions Why JS is fast & efficient in modern browsers Intro to V8 Architecture (in the next video!) Whether you're learning JavaScript deeply, preparing for interviews, or building high-performance apps, this video will supercharge your understanding of how JS works behind the scenes in 2025. 👉 Subscribe and turn on notifications for the upcoming video on V8 Architecture & Bytecode Optimization! #JavaScript2025 #JSRuntime #JavaScriptEngine #WebDevelopment #V8Engine #AdvancedJavaScript #JavaScriptDeepDive #FrontendMasters #CodeExecution