What is the term for an electrical signal that has only two states?

The term for an electrical signal that has only two states is "digital." Digital signals are characterized by their discrete nature, typically represented as either a high state or a low state, corresponding to binary values (such as 1 and 0). This binary representation allows digital systems, such as computers and digital communication devices, to process and store information efficiently.

Analog signals, on the other hand, can have an infinite number of values within a given range, representing continuous variations. While impulse signals refer to brief bursts of energy, they can be either analog or digital depending on their nature. Continuous signals, similar to analog, describe signals that change smoothly over time without discrete transitions. In the context of electronics and signal processing, the distinction between digital and analog signals is fundamental, making "digital" the correct term for signals with only two states.