Ginger Ale is a non-alcoholic beverage made with fermenting organic ginger root, water and sugar. The sugar is being consumed by the yeast and bacteria giving it a natural fizz and tang.
Ginger Ale also known as Ginger bug or Gingerbeer (like root beer) was originally, a brewed and fermented drink of ginger, spices and sugar. It used to have that fermented toddy like whiff and small alcohol content after fermentation hence the term beer was associated with it.