The ROOT framework provides a number of classes, grouped into several class cathegories. To start using ROOT, you may find useful to browse the following documents:

• Processing data with ROOT (to learn about the interactive and batch use of ROOT)
• Analyzing data with ROOT (about histograms and trees; mathematical and statistical tools)
• Showing results with ROOT (explaining pads, 2D and 3D graphics, and the GUI editor)
• Simulation in ROOT (about the virtual Monte Carlo and the geometry packages)
• ROOT I/O (explaining how to use ROOT files and trees, and how to access data from d/b or other nodes)