What is the difference between a spirit, a liqueur and a fortified wine?
They differ in how the alcohol got there and in whether sugar was added — and the categories explain most of what you find on a drinks shelf.
A spirit is produced by distillation. A fermented base — grain, grape, molasses, agave, potato — is heated, and because alcohol boils below water, the vapour is richer in alcohol. Condensing it produces a much stronger liquid.
Examples: whisky, gin, vodka, rum, brandy, tequila.
Typically 37.5–50% ABV, with legal minimums in most jurisdictions — 37.5% for most spirits in the UK and EU.
Generally unsweetened, though some categories permit small amounts.
What distinguishes them from each other is base ingredient, distillation method, and ageing. Whisky comes from grain and is aged in wood; gin is a neutral spirit redistilled with botanicals, of which juniper must be dominant; brandy is distilled wine.
A liqueur is a spirit with added sugar and flavouring. The defining features are sweetness and a lower strength.
Examples: Cointreau, Baileys, amaretto, Chambord, crème de cassis, Kahlúa.
Typically 15–30% ABV, and EU rules require a minimum sugar content to qualify.
A fortified wine is wine with spirit added — usually a neutral grape spirit.
Examples: port, sherry, madeira, marsala, vermouth.
Typically 15–22% ABV.
Why fortification exists, and the reason is more interesting than the definition: adding spirit stops fermentation. Yeast dies at higher alcohol levels, so fortifying mid-ferment leaves unfermented sugar behind — which is how port is both strong and sweet. Fortify after fermentation completes and you get a dry fortified wine, which is how fino sherry works.
It also originated as preservation, allowing wine to survive long sea voyages, which is why the great fortified wines come from ports that shipped to Britain.
Vermouth is additionally aromatised with botanicals.
Bitters and amari are a further category, flavoured with bittering agents.