What is JavaScript?

[Sascha]

• 
  JavaScript is a programming language used to make web pages interactive.
  
  
• 
  HTML builds the content, CSS designs it, and JavaScript brings it to life.
  
  
• 
  If a website reacts, moves, shows messages, validates forms, or updates without reloading, that’s JavaScript doing the work.
  

Example:
Html:


<p id="msg">Original Text</p>
<button onclick="changeText()">Change</button>





JavaScript:


function changeText() {
document.getElementById("msg").innerText = "Text changed!";
}





Advantages:

- Runs Directly in the Browser
No installation, no setup. Every browser already supports JavaScript.

- Makes Websites Interactive
Animations, form validation, sliders, popups, menus — all powered by JS.

- Fast Execution
Runs immediately in the user’s browser, so no waiting for server responses for every small action.

- Huge Ecosystem
React, Vue, Angular, Node.js — JavaScript has massive libraries and frameworks for building anything.

- Works on Both Frontend and Backend
With Node.js, you can build servers, APIs, and full apps using just JavaScript.

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