3-in-1 coffee means it’s a ready mix of coffee granules, sugar and creamer. All you have to do is empty the mix into a cup and pour in boiling hot water. No need to have separate containers and spoons for the coffee, milk/cream, and sugar.
It’s very convenient for people on the go. And there are so many variations these days. For example, San Mig Super Coffee has a “White” flavor variant that’s extra creamy. San Mig also have a Sugar-Free line that itself has three different kinds — Original, Mild, and Strong.