In most French supermarkets, you can get fresh milk in the dairy section or UHT milk on the shelf, where there is quite a wide choice of milks to choose from (low or no lactose, fortified with extra vitamins, etc.)
lait entier: full fat milk (red cap on the botte)
demi-écrémé: half skimmed milk (1.5% or 1.8% fat, blue cap on the bottle). This is the most common in France.
écrémé: completely skimmed (green cap on the bottle)
confiture de lait: dulce de leche
lait au chocolat: chocolate milk. A popular commercial version sold in bottles, Cacolac has been made in Bordeaux since 1954.
Images by Danone, Égoïté