1. Definition

V8 Engine is a JavaScript engine developed by Google that executes JavaScript code. It converts JavaScript into machine code so that it can run very fast on your system.

2. Who Developed V8 Engine

V8 Engine was developed by Google and is used in the Chrome browser and Node.js runtime environment.

3. Where it is Used

• Google Chrome browser
• Node.js runtime
• Other Chromium-based browsers

4. Why V8 Engine is Important

• Executes JavaScript very fast
• Converts JS into machine code (not interpreted line by line)
• Improves performance of web apps and servers
• Enables JavaScript to run outside browser (Node.js)

5. How V8 Engine Works

• Receives JavaScript code
• Parses and converts it into Abstract Syntax Tree (AST)
• Compiles it into machine code using Just-In-Time (JIT) compilation
• Executes code directly (very fast)

6. Example

JavaScript code you write:

let a = 10;
let b = 20;

console.log(a + b);

👉 V8 converts this into machine code and executes it quickly.

7. Advantages

• High performance
• Uses JIT compilation
• Efficient memory management
• Open-source and widely used