Software-Defined Radios (SDRs) are radio communication systems that replace traditional hardware components with software algorithms running on a computer or embedded system. They offer flexibility in signal processing, allowing reception, demodulation, and transmission across different frequencies and modulation types through software configurations.

One of the key advantages of SDRs is their cost-effectiveness. Compared to traditional radios, SDRs can be relatively inexpensive because they leverage standard computing hardware and open-source software. This makes them accessible to hobbyists and experimenters who can build or purchase SDR kits at very affordable prices.

Moreover, SDRs often rely on open-source software packages such as GNU Radio and various SDR libraries. These platforms provide a framework for developing custom radio applications and experimenting with different modulation schemes, signal processing techniques, and communication protocols. The open-source nature of these tools fosters a collaborative community of developers who contribute to improving functionality and expanding capabilities.

In summary, SDRs offer a cost-effective solution for radio enthusiasts to explore and innovate in the field of radio communication, leveraging open-source software for flexible and customizable signal processing.