The best and worst beer you will ever haveSo you probably have gone into a bar and maybe saw something labeled as beer on "cask". Or maybe you have seen some old English like long black tap handles where the bartender has to pump the the beer and for some unknown reason it takes forever.
So then what does this mean? What it means is on one hand you get smaller bubbles from the natural carbonation that makes the beer tastes more creamy. Often beers like stouts are put on cask to give them more of a creamy taste. Also often bitter beers like IPA's are put on cask to mellow them out.
What's the downside? Well the downside is that cask beer can go down hill fast. Just after a couple of days it can start becoming flat and muddy. Bad beer bars will serve beer on cask long after they should and when you drink them they taste awful, like if you left out a beer open for a day.
So next time when you get a chance, try a beer on cask and taste the difference. Look at it and notice the difference of the head and the richness of the taste.