A Zettelkasten-style system is just a bunch of files in a single folder, with lots of links between them.
What makes these kinds of notes work is the purpose they are written for, and the links. Two people can have the exact same notes, but link and tag them completely differently, because each of them will have different goals and purposes.
Hegel (b. 1770) is purported to have used a version of Zettelkasten, as described by Hegel's sister: "He approached his reading as follows: Everything that seemed remarkable to him he wrote on a separate sheet of paper, which he identified at the top by a general label under which the particular content had to be subsumed. In the center of the upper edge he then wrote in large letters—not infrequently using Fraktur letters—the keyword of the article. These pages he ordered alphabetically ... and thus could by means of this simple method use his excerpts at any moment. "
In a tech sense, yes, it's nothing more than a wiki. The difference lies in the usage: wikis tend to organize their content using encyclopedic categories and hierarchies. A Zettelkasten is supposed to be much more goal-oriented, so that the right notes are found and interacted with depending on our work.
Cuz as a millenial I've been using tomboy / gnote as a personal wiki long before 'zettlekassen' showed up on HN, and I know a few others who run more online wikis.
