It's an Icelandic yogurt that has a great calorie to protein ratio. It's actually more of a cheese than a yogurt. If you've ever had plain Greek yogurt then you'll have an idea of what skyr is like. It does have way more protein though. It's a pretty fucking good food all around. Anywhere you use sour cream or yogurt replace it with skyr. Less fat less sodium less calories and more protein. Shit's good yo.