Streamlit is an open-source Python framework designed to simplify the creation of interactive web applications for data science and machine learning projects. It enables users to build and deploy data-driven apps with minimal coding, requiring no front-end web development experience. Streamlit supports integration with popular Python libraries such as pandas, NumPy, Matplotlib, and Plotly, facilitating rapid development of dashboards and analytical tools. Applications can be deployed locally or hosted on platforms like Streamlit Community Cloud or Snowflake.