If we wander into any art gallery which shows a variety of work we are likely to see pictures identified as “digital images”, but the term is problematic. An “image” is something we see, but in what ways can an image be “digital”? And what, really, is the artwork?
Analogue vs digital
Technically, digital is contrasted with analogue. Analogue changes in any quantity are continuous, i.e. smooth at every scale, while digital changes are discrete, stepwise. For instance, the minute hand of an analogue clock moves smoothly and its position can be read to any desired accuracy, while a digital clock will say the time is (e.g.) 8.22 p.m until it says 8.23 p.m.