Django
In plain terms
A batteries-included Python web framework.
Going deeper
Django provides an ORM, admin panel, authentication, and structure out of the box for building robust web apps quickly. It favors convention and completeness.
Under the hood
Opinionated and full-featured; its admin and ORM accelerate development, sometimes at the cost of flexibility.
Examples
Content sites, Instagram (early), admin-heavy apps, full web applications.
Think of it like...
Like a fully-furnished home that's ready to live in immediately.