Streamlit is a powerful, open-source app framework designed for machine learning and data science teams.

Its main purpose is to simplify the process of creating and sharing beautiful, custom web apps for machine learning and data science.

It offers an intuitive interface and straightforward commands and doesn't require extensive web development skills, making it accessible to a broader range of users.

Streamlit's unique selling proposition is that it allows users to turn data scripts into shareable web apps directly, significantly reducing the time taken from prototyping to deployment.

It supports a range of inputs and controls such as sliders, text input, and others to capture user input, making it very interactive.

Streamlit also supports various popular data science libraries enabling easy integration and faster app creation.

The apps can be hosted and shared with others, facilitating easier collaboration.

Streamlit is primarily written in Python, expanding its reach to a wide base of developers already familiar with this language.

The framework streamlines data exploration, model debugging, and data visualization, making it an empowering tool for anyone working with machine learning or data science.