>>49580488It varies depending on the series since the franchise has various different settings, sometimes where the Digital World was deliberately created by humans, and some where the Digital World was an unintended result of consciousness forming within the sea of data collected by humanity
Generally though, the sky is the limit when it comes to digimon because they're derived from the collected sum of all human knowledge online, so they can be animals, machines, based on old human deities, the living incarnation of people shitposting on the internet, etc