Inserts the contents of the named module at the location of the tag.
{% include 'my_module' %}
The theme's layout contains the following:
{% include 'header' %}
<p>I hope you find what you're looking for :)</p>
The header module contains:
<h1>Welcome to my website!</h1>
When the page is viewed, the user would see:
<h1>Welcome to my website!</h1>
<p>I hope you find what you're looking for :)</p>