Hard seltzer, adult seltzer, mature seltzer, spiked seltzer and hard sparkling alcohol water is a type of highball drink containing seltzer, alcohol, and often fruit flavorings. In the US the alcohol is usually made by fermenting cane sugar or malted barley. Hard seltzer products outside of the US have been found to use either neutral spirit, or fermentation of fruit. The alcohol by volume is around 5% and the calorie-content is relatively low.

An alcopop is any of certain mixed alcoholic beverages with relatively low alcohol content, including:Malt beverages to which various fruit juices or other flavorings have been added Wine coolers: beverages containing wine to which ingredients such as fruit juice or other flavorings have been added Mixed drinks containing distilled alcohol and sweet liquids such as fruit juices or other flavourings