Wine is fermented grape juice that comes in three categories based on alcohol content. The top wine producing countries are France, Italy, Spain, the US, and Argentina. Important factors in winemaking include location, soil, weather, grapes, and process. Red grape varieties like Pinot Noir, Grenache, Merlot, and Cabernet Sauvignon produce wines with flavors like cherry, plum, and blackberry. White varieties like Chardonnay, Sauvignon Blanc, and Riesling make wines tasting of apple, pear, and citrus. Pairing wine with food depends on acidity, tannins, and flavors.