Karl Ferdinand Braun was a German physicist and inventor, born on June 6, 1850. He is best known for his contributions to the development of the oscilloscope and the radio. Braun's work in electronics laid the foundation for modern communication technologies. In 1897, he invented the Braun tube, an early type of cathode ray tube used in oscilloscopes. He also played a significant role in the development of wireless telegraphy, earning the Nobel Prize in Physics in 1909 alongside Guglielmo Marconi for their work in this field. Braun's innovations greatly influenced the evolution of electronic devices.