A&W Root Beer is an American brand of root beer that was founded in 1919 by Roy W. Allen and primarily available in the United States and Canada. Allen partnered with Frank Wright in 1922, creating the A&W brand and inspiring a chain of A&W Restaurants founded that year. Originally, A&W Root Beer sold for five cents.

Root beer is a sweet North American soft drink traditionally made using the root bark of the sassafras tree Sassafras albidum or the vine of Smilax ornata as the primary flavor. Root beer is typically, but not exclusively, non-alcoholic, caffeine-free, sweet, and carbonated. Like cola, it usually has a thick and foamy head. A common use is to add vanilla ice cream to make a root beer float.