JavaScript is the most widely used programming language in the world, and it has become the de facto language of the web. Despite being originally designed for creating dynamic web pages, it is now used for everything from server-side applications to mobile app development. With its easy-to-learn syntax and powerful capabilities, JavaScript has become an essential tool for any programmer looking to build web-based applications. In addition, the language has a large and supportive community, with countless resources available online to help programmers of all levels improve their skills and build better applications. Whether you're just getting started with programming or you're a seasoned pro, JavaScript is a language that you'll definitely want to have in your toolkit.
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We can use JavaScript in HTML with a script tag, this is Internal in HTML
<script>
function sum(a,b)
{
return a + b;
}
</script>
External, we can link JavaScript Files.
To link a JavaScript file to an HTML document, you can use the <script> tag in the HTML code. Within the tag, you can specify the source of the JavaScript file using the src attribute. For example, <script src="myscripts.js"></script> would link to a JavaScript file named "myscripts.js" in the same directory as the HTML document.