Digimon types - What are they all about?

[Stormy  Wizard]

Ah, I sort of get it now, Data type digimon are able to easily change into vaccine and virus types while vaccines and viruses don't normally change their types.

Patamon (data) --> Angemon (Vaccine) --> MagnaAngemon (Vaccine), etc

Demiveemon (data) --> Veemon (Vaccine) --> ExVeemon (Vaccine), etc

I don't know any digimon that change from Vaccine to Data naturally, ie, that follow a set digivolution path, or even virus to data. So, Data must be the neutral area after all, and once a digimon has the side that they're on (vaccine or virus) then they remain that way until they de-digivolve.