What is javascript and how is it different from HTML?

Answer 1

HTML, HyperText Markup Language, as it is used today in conjunction with CSS is a formatting language. It simply tells the browser what an element is on a webpage.

For example, your browser would interpret this markup as a paragraph:

<p>Text</p>

And this markup would be interpreted as a level 1 heading:

<h1>Text</h1>

That's all there is to HTML, simple!

JavaScript is more complex. It's a client-side scripting language used to control browser behavior.

For example, this JavaScript would cause the browser to throw up an alert:

<script type="text/javascript">

alert("Hello world!");

</script>

The alert is a behavior change on the part of the browser.