ROOT is an open-source data analysis framework designed for processing and scientifically analyzing very large datasets. Used in research across fields including high-energy physics, it supports analysis of petabyte-scale data; the project notes that more than two exabytes are stored in ROOT files and that ROOT played a role in the discovery of the Higgs boson. The framework is freely available to use and modify, and its open development process encourages users to contribute.

ROOT includes a C++ interpreter for rapid prototyping and provides a Python interface with dynamic bindings, alongside support for Jupyter notebooks. The project offers software releases, reference materials, manuals, and online forums to help users learn and work with the framework. It also organizes and participates in training, workshops, advanced courses, and hackathons for students, researchers, and developers. ROOT is maintained by the ROOT Team, with source code and project information available through its development resources.