Definition: international grape varieties

Here is the list of these so-called "international" grape varieties:
Reds
Cabernet Sauvignon
Merlot
Pinot Noir
Syrah-Shiraz
Whites
Chardonnay
Gewürztraminer
Riesling
Sauvignon Blanc
Sémillon
The ubiquity of these grape varieties is no obstacle to diversity; geography and climate also play a crucial role in winemaking. Although these grape varieties behave in the same way and have the same properties everywhere, they can produce radically different wines from one region to another.
Mastering international grape varieties is a daily necessity, but diversifying into local grape varieties is a major asset, provided you have a good understanding of them.