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Tcl (Tool Command Language) is a high-level, cross-platform dynamic language used for rapid prototyping, testing scripts, and application development. Scripts are written using commands that are organized into procedures and can be stored in libraries for future use. Tcl's syntax is flexible due to its use of simple data structures and dynamic typing without explicit declarations. The integration with C allows developers to create extensions as shared libraries that can be called from Tcl scripts. Used alongside the Tk toolkit library, Tcl becomes Tk ('tick'), which lets developers create graphical user interfaces (GUIs).