Software Defined Radio (SDR) is a technology that allows radio communication to be managed through software instead of traditional hardware components. This means that functions like modulation, demodulation, and signal processing can be performed using a computer or specialized software, making radios more flexible and adaptable to different frequencies and protocols. SDR systems can easily be updated or reconfigured to support new standards or technologies, which is a significant advantage over conventional radios. This adaptability makes SDR useful in various applications, including amateur radio, military communications, and emergency services, where quick changes to communication methods may be necessary.