What defines binary logic in digital circuits?

Binary logic in digital circuits is defined by a system where variables can only take on two distinct values: 0 and 1. This binary system is foundational to digital electronics and computing, as all data and instructions processed within a computer are ultimately represented in binary form. Each of these values corresponds to an electrical state; for example, 0 might represent a low voltage (off state), while 1 represents a high voltage (on state).

In this context, the simplicity of using just two states allows for the execution of complex logical operations through combinations of these two values. The principles of binary logic underpin the operation of logic gates—such as AND, OR, and NOT—enabling the creation of sophisticated circuits that form the basis of modern computation.

Other options refer to concepts that do not pertain to the binary nature of digital circuits. Methods of computing using decimal values pertain to different numeric systems and are not applicable when discussing binary logic. Similarly, a form of logic involving multiple truth values relates more closely to fuzzy logic, which incorporates more than two truth conditions, diverging from the strict binary framework. Lastly, techniques used for analog signals are grounded in continuous signal representations, which differ fundamentally from the discrete nature of binary logic.