Qu'est-ce qu'une âme ? Il est très facile de la définir négativement : 
c'est très exactement ce qui en nous se rétracte quand nous entendons parler de séries algébriques.
- Robert Musil, L'homme sans qualités 
Combinatorics on words, but also enumerative and algebraic combinatorics, are the topics on which I have been working since my Ph. D. Maybe the best way to grasp the object of this field is to have a hint at problems that preceded and favoured its birth. My suggestion is to go to J. Berstel's page presenting the work by M. Lothaire.

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