What is the difference between flagella and pili?

i) Flagella are the thin appendages, threads of proteins.

ii) They involve in motility.

iii) Its number and arrangement vary.

Pilli:

i) They are hair like structures.

ii) No involvement in motility.

iii) It attaches to surfaces of bacteria.

not sure if this is what you'r looking for eubacteria and archaebacteria