Globular clusters and their contribution to the formation of the
  Galactic halo
  This is a "biased" review because I will show recent evidence on the
contribution of globular clusters (GCs) to the halo of our Galaxy seen through
the lens of the new paradigm of multiple populations in GCs. I will show a few
examples where the chemistry of multiple populations helps to answer hot
questions including whether and how much GCs did contribute to the halo
population, if we have evidence of the GCs-halo link, what are the strengths
and weak points concerning this contribution.
