**GNU Radio**is a[free software](https://en.wikipedia.org/wiki/Free_software "Free software")development toolkit that provides signal processing blocks to implement[software-defined radios](https://en.wikipedia.org/wiki/Software-defined_radio "Software-defined radio")and[signal processing](https://en.wikipedia.org/wiki/Signal_processing "Signal processing")systems. It can be used with external[radio frequency](https://en.wikipedia.org/wiki/Radio_frequency "Radio frequency")(RF) hardware to create software-defined radios, or without hardware in a simulation-like environment. It is widely used in hobbyist, academic, and commercial environments to support both wireless communications research and real-world radio systems.
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The GNU Radio software provides the framework and tools to build and run software radio or just general signal-processing applications. The GNU Radio applications themselves are generally known as "flowgraphs", which are a series of signal processing blocks connected together, thus describing a data flow.- via [Wiki](https://en.wikipedia.org/wiki/GNU_Radio)
