Sherry is a fortified wine, a type of alcoholic beverage originating in the Muggle world but also consumed by wizards and witches. In the series, it is depicted as a liquid served in a glass and stored in bottles. Professor Trelawney is known to possess numerous bottles, some of which she refers to as “cooking sherry”, suggesting she is not always particular about its quality.
Sherry possesses no inherent magical properties. Its effects are consistent with those of Muggle alcoholic beverages. It is consumed for social purposes, as when Cornelius Fudge offers a glass to the Muggle Prime Minister, or as a means of “fortification” against stress and anxiety, which is Professor Trelawney's primary reason for drinking it. Excessive consumption can lead to intoxication and impaired judgment. Professor Trelawney is often described as smelling strongly of sherry, and her reliance on it is a significant character trait, particularly during her period of probation and eventual sacking under Dolores Umbridge.
Sherry, while a mundane item, plays a surprisingly significant role in the series, primarily through the actions of Professor Trelawney.
Sherry is a real-world fortified wine made from white grapes grown near the city of Jerez de la Frontera in Andalusia, Spain. Its inclusion in the series grounds the wizarding world in reality, showing that wizards and Muggles share certain cultural staples.