What is the primary difference between keg and cask beer?

The primary difference between keg and cask beer lies in the carbonation method and serving pressure. Keg beer is carbonated using CO2, which is typically added under pressure during the packaging process. This method allows for a consistent level of carbonation and enables the beer to be served through a tap that maintains this pressure, resulting in a sharper mouthfeel and a frothy head.

On the other hand, cask beer, also known as real ale, is traditionally conditioned in the cask and served without additional CO2 pressure. It is naturally carbonated through a secondary fermentation process within the cask, and it is usually served at cellar temperature, allowing it to be less fizzy and more smooth compared to keg beer. This method enhances the flavors and aromas of the beer, providing a different drinking experience.

The other options do not accurately represent the fundamental distinction between keg and cask beer. For instance, keg beer being naturally carbonated is incorrect, as it relies on pressurized CO2 for carbonation. Similarly, the claim that cask beer has a higher alcohol content is not inherently true, as the alcohol content of both types can vary independently. Lastly, the statement about filtering does not establish a primary difference between the two, as both keg and