Understand it better with this site

Handlebars is a simple templating language. Creates a dynamic template.

It uses a template and an input object to generate HTML or other text formats. Handlebars templates look like regular text with embedded Handlebars expressions

You place the handlebar template in header and then the script in it.

• Download from here .
• Add it to file

// From File

<script src="handlebars-v2.0.0.js"></script>

// From CDN

<script src="https://cdnjs.cloudflare.com/ajax/libs/handlebars.js/2.0.0/handlebars.js"></script>

• to create a template you have to do it this way using compile in js folder:

Obj.prototype.render = function () {
var source = $('#template').html();
var template = Handlebars.compile(source);
return template (this);
}