What is the primary difference between digital and analog signals?

The primary difference between digital and analog signals lies in how they represent data. Digital signals use discrete values, which means they represent information in distinct steps or increments, like binary code (0s and 1s). This allows for clearer and more precise transmission of data, as digital signals maintain their integrity better over long distances or in noisy environments.

In contrast, analog signals are characterized by continuous variations. They can take on any value within a given range, which allows them to represent a wider array of information but also makes them more susceptible to noise and distortion. As a result, analog signals can degrade with distance or interference, whereas digital signals can maintain their quality across greater distances.

The other options touch on some aspects of digital and analog signals but don't capture the fundamental distinction in their representation of data. For example, while it is true that analog signals often require more power and that digital signals can be more robust in the face of interference, these points do not directly address the core difference in how they convey information.