Which of the following best describes a digital signal?

The choice that states a digital signal is a continuous-time waveform signal used in digital communication captures the essence of what a digital signal represents. Digital signals are characterized by their ability to convey information in discrete values rather than continuous waveforms. This means that digital data is represented in binary form—using zeros and ones—allowing for robust data transmission with greater noise immunity.

In contrast to analog signals, which can vary endlessly and are susceptible to degradation and interference, digital signals maintain their integrity over longer distances due to the discrete nature of their representation. The ability to convert digital signals into various forms for communication, including sound, video, and text, further underlines their significance in modern technology and communication systems.

Understanding this definition is crucial, as it emphasizes the advantages of digital signals in terms of clarity, efficiency, and reliability, especially in the context of communication technology advancements.