Highlights
- Wine is a beverage made by fermenting grapes or grape juice, usually with yeast.
- Yeast converts grape sugars into alcohol and carbon dioxide.
- Wine production is not one fixed recipe.
- Grape variety, ripeness, climate, site, skin contact and winemaking decisions influence the finished wine.
- Red, white, rosé, sparkling, sweet and fortified are characteristics or approaches that can overlap.
Wine is an alcoholic beverage made primarily from grapes or grape juice through alcoholic fermentation. Yeast consumes fermentable grape sugars and produces alcohol and carbon dioxide, along with other compounds that contribute to the wine’s character.
The finished wine may then be matured, clarified, stabilised, blended, carbonated, fortified, bottled or packaged, depending on the style. Its colour, aroma, flavour and texture are influenced by the grape variety, ripeness, vineyard conditions, skin contact and decisions made during and after fermentation.
From grape to bottle
Wine production begins in the vineyard, but the journey from grape to bottle can vary considerably. There is no single sequence that every producer or style follows.
Grow → harvest → sort → crush, destem or press as appropriate → manage skin contact → ferment → mature and treat as appropriate → bottle or package.
Growing and harvesting grapes
Grapes are an agricultural raw material, so the wine’s story begins with how they grow. Grape variety, weather, climate, vineyard site and ripeness all affect the fruit that arrives at the winery.
Harvest timing is a decision rather than a universal rule. A producer may balance sugar, acidity, flavour development, colour, tannin and the intended wine style.
Crushing, destemming and pressing
Grapes can be crushed or destemmed, pressed as whole bunches, or left partly or wholly intact. Pressing separates juice from solid grape material. Crushing breaks the fruit and releases juice, while destemming removes some or all of the stems. These steps are not mandatory in every wine.
Skin contact and maceration
Grape skins contain colour compounds and other phenolic material. Maceration means keeping grape solids and liquid in contact so compounds can be extracted. The amount and timing of skin contact can change colour, flavour, texture and structure.
- Red wines are commonly fermented or macerated with their skins.
- Many white wines are pressed and fermented with relatively little skin contact.
- Rosé generally limits colour extraction from red-grape skins.
- Some white grapes are fermented on their skins, producing amber or orange-coloured wines.
Fermentation
Fermentation turns grape juice into an alcoholic beverage. Yeast converts fermentable grape sugars into ethanol, the main alcohol in wine, and carbon dioxide. It also produces other compounds that contribute aroma and flavour.
Some wines use selected yeast cultures, while others rely on spontaneous fermentation from yeast present in the grapes or winery environment. The beginner-level idea is simple: alcohol is generally created during fermentation rather than added to ordinary wine.
Maturation and other treatments
Fermentation is not necessarily the end of winemaking. Wine may be held in stainless steel, concrete, oak, glass-lined tanks or other vessels. It may spend time with lees, the solids that settle after fermentation, including yeast cells and other grape or fermentation material.
Wine may also be clarified, filtered, stabilised or blended. Maturation does not automatically mean oak ageing. Oak is one possible vessel or influence, not a requirement.
Carbonation, fortification and packaging
Some wines contain dissolved carbon dioxide, giving them bubbles. Fortified wines have alcohol added during or after fermentation. Fortified wine is not automatically sweet: sweetness and fortification are separate characteristics. Finally, wine is bottled or otherwise packaged and may be stored before release.
Why do wines look and taste different?
Wine’s character usually comes from several influences working together rather than one factor acting alone.
Grape variety, ripeness, climate and site
Different varieties have different combinations of sugars, acids, colour compounds, tannins and aroma precursors. As grapes mature, these components change. Temperature, sunlight, rainfall, altitude, exposure and other site conditions also influence vine growth and grape development.
The same variety can therefore produce different wines in different vineyards or under different winemaking approaches.
Skin contact, fermentation and maturation
Skin contact is one of the clearest reasons wines differ in colour and structure, but its effects depend on timing, temperature and duration. Fermentation conditions, vessel, oxygen exposure, time and post-fermentation treatments can all affect character. Oak and lees contact may influence flavour, texture and integration. Neither guarantees better wine.
Blending
Blending combines wines or components, including grape varieties, vineyard parcels or vessels. It is not evidence of poor quality, just as a single-variety wine is not automatically superior. It is one way to shape balance and style.
Sweetness, acidity, tannin, body and alcohol
- Sweetness is mainly associated with residual sugar left after fermentation.
- Acidity contributes freshness and tension.
- Tannin can contribute grip or a drying sensation.
- Body is an overall impression of weight or fullness.
- Alcohol can contribute warmth, weight and balance.
A wine can smell strongly of ripe fruit without being sweet. These structural elements interact in how the wine feels.
The main types of wine
These categories are useful for orientation, but they are not one complete universal legal classification. Colour, sweetness, carbonation and fortification describe different dimensions, so categories can overlap.
| Type | What it means | Usual production distinction |
|---|---|---|
| Red | Commonly red, purple or ruby. | Usually made with red grapes and skin fermentation or maceration. |
| White | Commonly pale yellow, straw, greenish or gold. | Often pressed and fermented with limited skin contact. |
| Rosé | Pink or salmon-coloured. | Usually limited colour extraction from red-grape skins. |
| Sparkling | Contains dissolved carbon dioxide that produces bubbles. | Bubbles may arise from fermentation in bottle or tank, or another permitted process. |
| Sweet | Noticeable sweetness, generally associated with residual sugar. | Sugar remains through the production approach used. |
| Fortified | Alcohol level has been increased by adding alcohol. | Alcohol is added during or after fermentation. |
A wine can be white and sweet, red and sparkling, or fortified and sweet. “Sparkling” describes bubbles while “sweet” describes a characteristic mainly associated with residual sugar. “Dry” generally means low or barely perceptible residual sugar. It does not necessarily mean non-fruity, highly acidic or better quality.
A short Australian context
Wine in Australia is both an agricultural product and a cultural beverage. Australian readers will also encounter practical information on wine labels.
Under Food Standards Australia New Zealand requirements, beverages containing 0.5% alcohol by volume or more must include alcohol-content information; beverages over 0.5% must include a statement of standard drinks; and alcoholic beverages over 1.15% must generally carry the prescribed pregnancy-warning label, subject to the Food Standards Code and applicable exceptions.
These are label requirements, not a complete explanation of Australian wine law. Regulatory details can change, so check current FSANZ guidance when using label information.
Terms that need care
Natural wine
“Natural wine” does not have one universally accepted definition. It should not automatically be described as wine with nothing added, or as healthier, more authentic or better.
Traditional
“Traditional” may refer to a method, region, vessel or historical practice. It is not, by itself, a guarantee of quality or minimal intervention.
Old World and New World
These broad informal groupings can oversimplify the diversity of wine regions and producers. They are not necessary to understand the basic definition of wine.
Amber or orange wine
Amber or orange wine is generally made from white grapes using red-wine-style techniques, including fermentation with skins, seeds and sometimes stems. It is not simply white wine that has accidentally oxidised.
FAQs
Is wine just grape juice with alcohol added?
Usually, no. Yeast converts fermentable grape sugars into alcohol during fermentation. Fortified styles can involve alcohol being added during or after fermentation.
Does all wine contain grapes?
Wine is primarily associated with grapes and grape juice, and the OIV’s technical framework defines it through fermentation of fresh grapes or grape must. Legal definitions may vary between jurisdictions.
Why is red wine red?
Red wine is commonly fermented or macerated with grape skins, extracting colour compounds and other phenolic material.
Can white wine be made from red grapes?
Yes. If the juice has little contact with the dark skins, it can remain pale.
Is rosé made by mixing red and white wine?
Methods vary. Rosé generally involves limiting colour extraction from red-grape skins, often through short skin contact or direct pressing.
What makes a wine sparkling?
Dissolved carbon dioxide creates the bubbles. It may come from fermentation in a bottle or tank, or another permitted process.
Is sweet wine the same as fruity wine?
No. Wine can smell or taste fruity without noticeable sweetness. Sweetness is mainly associated with residual sugar.
Is fortified wine always sweet?
No. Fortification and sweetness are separate characteristics.
What does “dry” mean?
It generally means low or barely perceptible residual sugar. It does not necessarily mean non-fruity or highly acidic.
What is orange or amber wine?
It is generally wine made from white grapes using red-wine-style skin fermentation, which can give deeper colour and a different texture.