Template Language Terms in Django

Let’s quickly review some Django Template Language terms

• A template is a text document, or a normal Python string, that is marked up using the Django template language. A template can contain block tags and variables.
  
  
• A block tag is a symbol within a template that does something. This definition is deliberately vague. For example, a block tag can produce content, serve as a control structure (an if statement or for loop), grab content from a database, or enable access to other template tags.
  Block tags are surrounded by {% and %}:
  

  {% if is_logged_in %}
    Thanks for logging in!
  {% else %}
    Please log in.
  {% endif %}

• A variable is a symbol within a template that outputs a value.
  Variable tags are surrounded by {{ and }}:
  

  My first name is {{ first_name }}. My last name is {{ last_name }}.

• A context is a name -> value mapping (similar to a Python dictionary) that is passed to a template.
  
• A template renders a context by replacing the variable “holes” with values from the context and executing all block tags.