DOT Language
DOT is a plain text graph description language. It is a simple way of describing graphs that both humans and computer programs can use. DOT graphs are typically files that end with the .gv (or .dot) extension. The .gv extension is preferred in cases where there could be confusion with the .dot file extension used by Microsoft Office 2003.
Various programs can process DOT files. Some, like dot, neato, twopi, circo, fdp, and sfdp, will read a DOT file and render it in graphical form. Others, like gvpr, gc, accyclic, ccomps, sccmap, and tred, will read a DOT file and perform calculations on the represented graph. Finally, others, like GVedit, KGraphEditor, lefty, dotty, and grappa, provide an interactive interface. Most programs are part of the Graphviz package or using it internally.
Read more about DOT Language: A Simple Example, Layout Programs, Limitations, Other Graph File Formats
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