Flask gives you routing, templates, and sessions without Django's batteries — you pick your own ORM and auth. Used for microservicesAn architecture splitting applications into small independent services — each deployed and scaled separately., internal tools, ML model APIs, and prototypes. Example: a 50-line app that serves JSONJavaScript Object Notation — a lightweight text format for structured data exchange on the web. from a SQLite DB and renders HTMLHyperText Markup Language — the standard markup for structuring web pages. with Jinja templates.

Flask became PythonA high-level language known for readability — dominant in data science, scripting, and web backends.'s lightweight alternative to Django for APIs and small services.

It proved a microframework could stay minimal while powering serious production apps via extensions.