KNIME is an open-source platform for data science that allows users to create visual workflows for data preparation, machine learning, and analysis without extensive coding. It offers a free and intuitive graphical user interface where users connect nodes to perform tasks, making it accessible to both technical and non-technical users. KNIME is used for end-to-end data science, from preparing and analyzing data to deploying insights and automating processes, with a commercial complement called KNIME Business Hub for enterprise collaboration and deployment.