is a software framework for data analysis and I/O: a powerful tool to cope with the demanding tasks typical of state of the art scientific data analysis. Among its prominent features are an advanced graphical user interface, ideal for interactive analysis, an interpreter for the C++ programming language, for rapid and efficient prototyping and a persistence mechanism for C++ objects, used also to write every year petabytes of data recorded by the Large Hadron Collider experiments. This introductory guide illustrates the main features of ROOT which are relevant for the typical problems of data analysis: input and plotting of data from measurements and fitting of analytical functions. page 
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Get Started page
ROOT Primer page
First steps with ROOT page
Working with an interactive ROOT session page … and the ROOT prompt is displayed:
Welcome to ROOT 6.28/04
⇒ Cling
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A combination of a Croquet reflector, a chat pane driven by Croquet, a "beam" of overlapping graphs (using the particle accelerator / Collider terminology theme), a property graph editor/creator similar to Marc Pierson's tetrahedron model (Person, Ideal, Org, Action), and a large graph pane showing all the graphs selected in the "beam" pane.