
The baker kneads a lot and works with "leavened" doughs, which contain yeast or sourdough.
He needs a slightly warm atmosphere, not cold, for his doughs to rise properly.

The pastry chef uses little or no kneading, no yeast or sourdough, and lots of butter, cream and eggs.
His doughs or creams require a cool, even chilly, atmosphere.

Giving a pastry a turn means folding it in on itself, even though it's made up of a layer of butter enclosed between 2 layers of pastry.
This is of course the case with puff pastry, but also and above all with croissant pastry or puff pastry (croissant dough).

So that's what the tourier's job is: they give the rounds, and they take care of all the products in this model, especially the viennoiserie.
So he's the one who makes croissants, pains au chocolat, raisin bread, etc.
In practice, it often happens that the tourier is also in charge of foncer, i.e. he or she rolls out the shortbread or sweet dough and lines the molds for the tarts and tartlets that the pâtisser will then line.
According to professional terminology, "the tourier prepares all types of dough for viennoiseries, tarts, savory and sweet puff pastries. He applies the techniques of melting, shaping and making the most common creams and fillings".

It's a lot of work to give a dough its turns, and of course the tourier doesn't work with a rolling pin like we do at home, he uses a machine all the time to roll out his dough, making it go back and forth between 2 metal rollers with adjustable spacing.
But the rolling machine isn't everything, and you also need a certain amount of experience to appreciate the dough's behavior, its level of fermentation, its temperature, its toughness, etc.