der Weinkeller
wine cellar
A cool, usually underground room used specifically for storing wine under optimal conditions.
Der Sommelier holte eine besondere Flasche aus dem Weinkeller.
The sommelier fetched a special bottle from the wine cellar.

wine cellar
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wine cellar
A cool, usually underground room used specifically for storing wine under optimal conditions.
Der Sommelier holte eine besondere Flasche aus dem Weinkeller.
The sommelier fetched a special bottle from the wine cellar.

This word is simply made up of 'Wein' (wine) and 'Keller' (cellar). So the meaning is literally a cellar for wine.
Ein guter Weinkeller muss dunkel und kühl sein.
A good wine cellar has to be dark and cool.
The context tells you whether the private storage room or the public venue is meant. If someone 'lagert' (stores) or 'holt' (fetches) wine, it is the storage room. If someone 'in einen Weinkeller geht' (goes to a wine cellar) or 'einen Tisch reserviert' (reserves a table) there, it is the restaurant.
Er holte einen alten Rotwein aus seinem Weinkeller.
He fetched an old red wine from his wine cellar.
Pay attention to the case after the preposition 'in'. Movement is expressed with the accusative ('in den Weinkeller gehen' — to go into the wine cellar), while a location or state uses the dative ('im Weinkeller sein' — to be in the wine cellar).
Wir gehen in den Weinkeller, um eine Flasche auszusuchen.
We are going into the wine cellar to choose a bottle.
basement
'der Keller' and 'der Weinkeller' both often refer to a room under a building. 'Keller' is the general room for many things, such as supplies, boxes, or bicycles. A 'Weinkeller' is a special cellar for wine, usually cool and suitable for storage. In addition, 'Weinkeller' can also mean a restaurant or bar in a cellar where there is a lot of wine. The words can be confused because a 'Weinkeller' can be a kind of 'Keller'. If wine is not important, 'Keller' fits better; if it is specifically about wine storage or a wine bar, 'Weinkeller' is more precise.

Heute Abend besuchen wir einen kleinen Weinkeller in der Altstadt.
Tonight we're visiting a small wine cellar in the old town.
Im Keller sucht Paul nach den alten Fotoalben.
Paul looks for the old photo albums in the basement.