Which description best describes a digital signal?

• A. Analog
• B. Digital
• C. Discrete
• D. Continuous

Answer: (B)

Digital signals store and convey information using a limited set of distinct values, typically 0 and 1, at specific moments in time. This stepwise, quantized nature means the signal changes only at discrete moments and can only take on a finite number of values. Because the values are discrete, digital signals are more resistant to small noise—tiny fluctuations don’t alter the value unless they cross a defined boundary. In contrast, analog signals vary smoothly and can take an infinite number of values. So, the description that fits best is digital, since it emphasizes encoding information with discrete values rather than continuous variation.