# JavaScript Notes  --- ## What is JavaScript? JavaScript is a high-level, interpreted programming language used to create interactive and dynamic web applications. It runs in browsers and on servers using environments like **Node.js**. --- ## Features of JavaScript - Lightweight and interpreted - Dynamically typed - Event-driven - Prototype-based object-oriented - Single-threaded with asynchronous support - Runs on client-side and server-side --- ## JavaScript Execution Model 1. Parsing of code 2. Creation of execution context 3. Code execution --- ## Variables ### Declaration Keywords ```js var name = "Amber"; // function scoped (avoid) let age = 22; // block scoped const isDev = true; // block scoped, cannot be reassigned
