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SDR (Software-defined radio) is a radio communication system where components that have been traditionally implemented in hardware (e.g. mixers, filters, amplifiers, modulators/demodulators, detectors, etc.) are instead implemented by means of software on a personal computer or embedded system.
RTL-SDR is an inexpensive and very popular software defined radio that uses a DVB-T TV tuner dongle based on the RTL2832U chipset.