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Champagne comes from three varieties, one white (the Chardonnay) and two reds (Pinot noir and Pinot meunier).
Blanc de Blanc is therefore a Champagne from the only Chardonnay grape variety, when a Blanc de Noir is a Pinot wine.
Vintage Champagne is produced only in the best years. It is marketed only three years later.
The special cuvées, finally, are produced with the best wines of each house, each house. They give an image of the quality of the house. It is the Crystal of Roederer, Dom Perignon for Moët, Count of Champagne for Taittinger ...
A few terms, which allow you to better understand the sugar dosage:
Gross: up to 2 grams of sugar
Extra-dry: from 2 to 3 grams
Dry: from 3 to 6 grams
Half Dry: 6 to 8 grams
Gentle: 8 to 10 grams
The taste of the consumer has now been diverted from the Demi-Sec, concentrating almost entirely on the Brut.