1, "three-in-one coffee" is also called "instant coffee": it refers to the mixture of creamer, sugar and coffee, which is instant.
2. "Two-in-one coffee" is a mixed coffee composed of coffee powder and coffee partner.
3. The difference between "three-in-one coffee" and "two-in-one coffee" is that "two-in-one coffee" removes sugar from "three-in-one coffee", so it contains no sugar.
Extended data
Three in one coffee is also called instant coffee. Although instant coffee is not as mellow as pure coffee directly ground from coffee beans, compared with ground coffee, instant coffee has the advantages of convenience, instant drinking, no need for much professional coffee knowledge and equipment, and no influence from brewing equipment, which greatly improves the public's acceptance.
Refer to Baidu Encyclopedia-Three in One Coffee