Being 'digital' is not so mysterious. It is what it sounds like. You work online and use digital tools such as a laptop or smartphone to carry out your work. This is how many of us work. Even if we meet at the same office every day at 9.
The word 'nomad' is an older term which covers people who do not have a fixed place of residence, but move from place to place, often with the aim of finding more food, new pastures and a better climate. Originally, that kind of liquid lifestyle was therefore about survival.
Today, we are more privileged and can choose to live as a digital nomad. Now it's more about having the possibility or the freedom to move without losing his livelihood.
A modern digital nomad is therefore a person who is not dependent on a geographical location to carry out his (digital) work, but has the freedom to travel around and, to a greater extent, work on his own terms.
But traveling is not necessarily what drives you. Just working regardless of residence. The flexibility and freedom to travel when you feel like it. In principle, the work can easily take place from the same foreign base, as long as you have a visa that covers you.