I originally found this in the deli counter of the grocery store, I loved it so much I recreated it. I call it "mousse" since it is the closest in texture to a mousse, however I realize it is not a traditional mousse in the true sense of the word, but it is nice when you don't feel like messing with complicated preparation. It is great because it's so easy, and uses common ingredients (for those times when you're in a pinch) and is adaptable to suit individual tastes & preferences. It's great for any take alongs or potlucks, because it isn't likely to be duplicated by others and it goes well with many other types of food, any time of year, any weather, & for any occasion. It is best to make 24 hrs. ahead as the marshmallows soften over night, (which makes your end result even more airy and light), but it can also be made in a hurry. Don't forget to allow for thaw time on the whipped topping when you are planning ahead (since it will be frozen when you buy it). I even took it one year to a Halloween party, made a scary little sigh for it and called it "Ghost Poop". This is also a great one to make with the kids. It can be rich or light depending on how you alter it to suit you taste, as I have it here, it is on the richer side. It lasts nicely throughout the week for your family as well, when you need just a moment of sweet comfort. It just reminds me that in life, sometimes the best things don't have to be complicated to be good and satisfying... Also, one variation is that after you have refrigerated it for 24 hrs or so to let the marshmallows soften, you can then freeze this and serve frozen or partially frozen.