Archaebacteria or Archaens though have a suffix bacteria added to it, it seems to have diverged from bacteria and more closely related to eukaryotes. This conclusion comes largely from the comparisons of genes that code ribosomal RNAs.
Despite knowing about the weird inhabitations of the archaeans there are certain key characteristics that make it more interesting. Their cell walls lack peptidoglycan (an important structure found in almost bacteria), the lipids in cell membranes of archaebacteria have distinctive ribosomal RNA (rRNA) sequences. With recent discovery, it is seen that it contains introns in its genetic material which is unlike bacteria.