Infusing a drink with nitrogen is actually something that began in the beer industry. Nitro beers are rich and frothy with tiny bubbles that almost taste sharp. Nitro coffee is nothing new. It’s coffee that’s been infused with nitrogen gas.
The creamier taste - either in beer or in coffee - is due, in part, to the smaller nitrogen bubbles.
Nitrogen gas doesn't easily dissolve in water, giving the brew a thicker, more velvety "mouthfeel." To get nitrogen into the liquid, the tap needs a "restrictor plate" to squeeze the drink through tiny holes, giving the beverage a particularly smooth and frothy head.
Such is the ultimate appeal of a glass (or can) of nitro cold brew: more than most other coffee beverages, it’s perfect as it is. The fullness of its rich body eliminates the need for milk while the complexity of the nitro allows for a flavor just sweet enough that you wouldn’t dare add sugar.
Coffee lovers say that nitro coffee is creamier and richer than straight up iced coffee. Some say it also tastes sweeter than your average cold brew.