Let's look closely at a sample wine label to understand what is listed there and why. The year in which the wine grapes themselves were harvested. The producer owns or directly controls the vineyards from whose grapes this wine was produced. The winery itself must also be physically located on the specified vineyards. Wineries have become quite creative in how they blend this message with the rest of the label.
Some wineries blend a major varietal with similar varietals for better flavor balance.
The region where the grapes were grown. We've only just scratched the surface with this brief overview.