Django template language ทำงานอย่างไร?

{{ article.title }}
Author: {{ article.author.name }}       


{% if user.is_authenticated %}
  Welcome, {{ user.username }}
{% else %}
  Log in
{% endif %}

{% for article in articles %}
  {{ article.title }}
{% empty %}
  No articles yet.                      
{% endfor %}


{{ name|upper }}                                  
{{ article.body|truncatewords:30 }}               
{{ price|floatformat:2 }}                          
{{ date|date:"Y-m-d" }}