Other mistake: The DigiDestined refer to Arukenimon by name before she formally introduces herself. Before her introduction, it is not established that the strange woman is in fact a Digimon.
Other mistake: When Veemon, Armadimon and Hawkmon are about to rush in and save Gatomon, a previous frame of Hawkmon's beak stays on-screen. (00:16:15)





Answer: Digimon started as a series of virtual pets, making them digital. In the television series, Digimon live in the "digital world."
Bishop73