Partials are reusable template fragments.

Examples:

• navbars
• footers
• alerts
• “card” components

Create a partial

templates/partials/_navbar.htmltemplates/partials/_navbar.html:

<nav>
  <a href="{{ url_for('home') }}">Home</a>
  <a href="{{ url_for('about') }}">About</a>
</nav>

<nav>
  <a href="{{ url_for('home') }}">Home</a>
  <a href="{{ url_for('about') }}">About</a>
</nav>

Include it in another template

{% include "partials/_navbar.html" %}

{% include "partials/_navbar.html" %}

Where to use includes

• inside base.htmlbase.html to share nav/footer
• in pages to share repeated UI patterns

Tip: naming convention

Many teams prefix partials with __ (like _navbar.html_navbar.html) to signal “not a full page”.

Jinja doesn’t require it, but it helps humans.