Interview question

What is the difference between {% include %} and {% extends %} in Django templates? Django templates में {% include %} और {% extends %} में क्या अंतर है?

Answer

Tag	Purpose	Relationship
{% extends %}	Inherit a parent template's structure, override blocks	Child-parent (one template extends another)
{% include %}	Insert another template's content directly at that point	Composition (embedding a reusable fragment)

# navbar.html - a reusable fragment
<nav>
    <a href='/'>Home</a>
    <a href='/books/'>Books</a>
    {% if user.is_authenticated %}
        <a href='/logout/'>Logout</a>
    {% endif %}
</nav>

# base.html uses include to embed the fragment
<body>
    {% include 'navbar.html' %}
    {% block content %}{% endblock %}
</body>

# Passing extra context to an included template
{% include 'book_card.html' with book=featured_book highlight=True %}

# only=True limits the included template to ONLY the passed variables,
# not the full surrounding context
{% include 'book_card.html' with book=featured_book only %}

# A template can use BOTH extends and include together
# page.html
{% extends 'base.html' %}
{% block content %}
    {% include 'book_card.html' with book=book %}
{% endblock %}

# KEY DIFFERENCE: extends is about INHERITING a page's overall layout
# (one per template, must be the first tag); include is about REUSING
# a fragment (can be used multiple times, anywhere in the template)

Tag	उद्देश्य	Relationship
{% extends %}	Parent template inherit करना, blocks override करना	Child-parent
{% include %}	दूसरे template का content directly insert करना	Composition

# navbar.html
<nav>
    <a href='/'>Home</a>
    <a href='/books/'>Books</a>
</nav>

# base.html include use करता है
<body>
    {% include 'navbar.html' %}
    {% block content %}{% endblock %}
</body>

# Included template को extra context देना
{% include 'book_card.html' with book=featured_book highlight=True %}

# only=True सिर्फ passed variables तक सीमित करता है
{% include 'book_card.html' with book=featured_book only %}

# extends और include साथ भी use हो सकते हैं
# page.html
{% extends 'base.html' %}
{% block content %}
    {% include 'book_card.html' with book=book %}
{% endblock %}

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