What is JavaScript?

The language of the web

JavaScript adds behaviour to web pages. Unlike HTML and CSS it is a programming language — you give the browser instructions.

Adding JS to a page

<script src="script.js" defer></script>\n\n// inside script.js\nconsole.log("Hello from JavaScript!");

The console

Open DevTools (F12) → Console. console.log() prints values here — your number-one debugging tool.

Your first lines

let name = "Ama";\nconst age = 25;\nconsole.log(name, age);

Statements & comments

// single-line comment\n/* multi-line\n   comment */\nlet x = 5;  // statement ends with ;

Tip: Press F12 in any browser and type code directly into the Console to experiment instantly.