Amaro is an Italian aperitif or digestif with a bittersweet, herbal flavor. It can be simply served on the rocks or use it in any drink that calls for Campari. The alcohol content will vary depending on the brand between 16% to 40%. There are many brands with varying flavors and strengths. One popular version in the United States is Campari.
You can purchase Amaro at most well-stocked liquor store. It is also available at Bevmo.com.