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In the last 20 years, the discoveries of tenths of exotic candidates has challenged the simplistic quark model predictions, most notably in the charmonium sector. While no consensus on their nature has been reached in the community, it is time to have a critical review of our understanding of the sector, to see what developments can be expected in the near future. I will review the most relevant experimental observations of the last few years, and discuss the theoretical and phenomenological tools that will help us to move forward in understanding this complicate sector of QCD.