Zero-carb vs near-zero-carb
True zero-carb foods are mostly plain animal foods and fats. Many practical keto snacks are near-zero-carb because seasonings, dairy, cured meats, or packaged products can contain small amounts of carbs.
If you are strict keto, read labels and track net carbs. If you are low-carb rather than therapeutic keto, a small carb amount may still fit your day.