Digital describes data, devices, or systems that use discrete numbers (usually 0s and 1s) rather than continuous signals. It can also relate to fingers or digits in the original sense.
From "digit" plus the adjective suffix "-al." The technical sense comes from using digits (numbers) to represent information, which became common with electronic computing in the 20th century.
Digital started out meaning "about fingers" and now describes computers that count using two "fingers": 0 and 1. Almost every photo, song, and message you see is really a long pattern of these tiny on/off digits.
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