The wine-making process begins with the grape harvest. Grapes are picked by hand or by machine and are then crushed and pressed. The juice that comes out of the grapes is called must, and this is what will be fermented to produce wine.
After the grapes are pressed, the must is transferred to a fermentation vessel where yeast is added. The yeast will eat the sugar in the must and convert it into alcohol. This process of fermentation can take anywhere from a few weeks to a few months.
Once the fermentation is complete, the wine is then transferred to barrels or bottles for aging. This aging process can last for years, and it is during this time that the wine develops its complex flavors and aromas.