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Prokaryotes are archaea. The nature of the difference between their cell walls and other single cell organisms is not fully explored, and whether they formed from convergent evolution or not is still up for debate: https://en.m.wikipedia.org/wiki/Pseudopeptidoglycan

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Archaea are prokaryotes, but not all prokaryotes are archaea.

Last I knew, they were considered two separate domains?

I don't doubt there is some relationship, but that isn't the definition of domain. Otherwise we'd have 1 domain.

Prokaryotes = Bacteria | Archaea

Again, there are three domains afaik: Prokaryotes, archaea, eukaryotes.

I'll cut this thread short and Google it for you:

> Archaea (/ɑːrˈkiːə/ (listen) ar-KEE-ə; SG: archaeon /ɑːrˈkiːən/ ar-KEE-ən) is a domain of single-celled organisms. These microorganisms lack cell nuclei and are therefore prokaryotes.

https://en.m.wikipedia.org/wiki/Archaea

There’s actually two ways of seeing this: the three-domain system and the two-domain system.

The three-domain system divides life in Archaea, Bacteria, and Eukarya. In this system, Archaea and Bacteria can be grouped together as prokaryotes.

In the two-domain system, the division is between Archaea and Bacteria. In this case, eukaryotes are seen as a subgroup of Archaea.

Hope to have cleared up some of the confusion.

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