curly braces html code example

Example: double curly braces in html

The double curly brackets are not HTML but scripting code. 
The term inside, interest, is a placeholder, sort of like the name 
and address in a form letter. The string {{interest}} 
will be replaced when the HTML template is converted into straight HTML 
that is sent over the network to the user.
example:
<p> The interest earned is: {{interest}} </p>