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Even though digital is still electronic, and is based on voltage levels, digital has become viewed as the opposite of analog. The outstanding trait of digital is that it's based on binary signaling. By defining two states by voltage levels (high or low, on or off), noise is practically eliminated.
Noise is common in analog communications. For the longest time noise had to be tolerated in audio and video, for instance. Analog duplication (tape recorders) is plagued by increased noise and lesser quality copies, with each generation.
Then a few decades ago devices could be made fast enough that binary signaling is practical. A performance can be duplicated ad infinitum generation after generation, without the addition of noise, and no breakdown of signal quality.
Digital: just means "clear states". Like ON/OFF or FORWARD/STOP/REVERSE. Or: 1, 2, 3, 4...
In opposite analog: it means there is a range. Like car battery voltage from 10.5V to 14.4V. Or "soft" statements like cold and warm, where no clear definition exists.
Analog values continously change. If you measure room temperature now...it will change the next moment, even maybe just by 0.0001°C
Signal means "information". We - in this forum - often think of electrical signals, like current, voltage, frequency...but a signal may also be optical (IR remote control, or even the signal of a lighthouse. Signal may also be accoustic, like musik, speech, ultrasonic sound, a buzzer..
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