Question

the deffrences between flagella and pili

Answer 1

With flagella the organism can move. Pili are for conjugation.

Answer 2

"Pili(singular-pilus) are the hair like appendages found on the surface of many bacteria whereas Flagella(singular-flagellum) are tail like projections that protrudes from the cell body.
pili are require for bacterial conjugation whereas flagella functions in locomotion.

Pili are primarily compose of pilin proteins and flagella are made of protein called flagellin."
~ http://wiki.answers.com/Q/What_is_the_difference_between_flagella_and_pili

Hope this helps!