Here's the breakdown:
* Eau de Cologne (literally "water of Cologne") was first created in Cologne in the 18th century by Johann Maria Farina.
* Farina's fragrance, a citrus-based perfume, became incredibly popular and was known as "Kölnisch Wasser" in German.
* Over time, the name "Kölnisch Wasser" was shortened to "Cologne" in English.
* Today, "cologne" is a generic term for a type of men's fragrance, even if it's not actually made in Cologne.
So, while the specific fragrance created by Farina is known as "Eau de Cologne", the general term for a type of men's fragrance is "cologne" thanks to the city of Cologne's historical connection with this type of perfume.