What is JavaScript?
JavaScript is a programming language that runs in your browser. It enables you to make web pages interactive — from button clicks and forms to games and animations.
Variables and Data Types
In JavaScript, you store values using variables like let, const, and var. Data types include strings, numbers, booleans, arrays, and objects.
Functions and Events
Functions let you group code into reusable blocks. JavaScript can respond to user events like clicking buttons or typing in a form with addEventListener.
DOM Manipulation
JavaScript interacts with the Document Object Model (DOM) to dynamically change your page — update text, show/hide elements, or animate sections without reloading.
Where is JavaScript Used?
- Form validation: Check user inputs before sending to the server.
- Games and animations: Interactive visuals and controls.
- APIs and AJAX: Fetch live data without reloading the page.
- Frontend frameworks: Tools like React, Vue, and Angular are all JavaScript-based.