Is Brut a real champagne

It is a sweetness designator in dry sparkling wines wit Brut meaning less than 12 grams of sugar per liter, Extra Brut having less than 6 grams of sugar per liter and Brut Natural or Brut Zero indicating 3 grams of sugar per liter. If you need a quick sugar fix order Doux or Dulce with 50 grams or more of sugar per liter.