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Since their introduction by Furstenberg [3], joinings
have proved a very powerful tool in ergodic theory. We present
here some aspects of the use of joinings in the study of
measurable dynamical systems, emphasizing
the links between the existence of a non trivial common factor and the existence of
a joining which is not the product measure,
how joinings can be employed to provide elegant proofs of classical results,
how joinings are involved in important questions of ergodic theory, such as
pointwise convergence or Rohlin's multiple mixing problem.