How does the classification system for Port (e.g., Vintage, Late Bottled Vintage, Reserve) work, and what do these classifications indicate about the quality and characteristics of the wine?

How does the classification system for Port (e.g., Vintage, Late Bottled Vintage, Reserve) work, and what do these classifications indicate about the quality and characteristics of the wine?
Admin 1 day, 15 hours ago in Port & Sweet Wines
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