Complexity refers to the layers of flavour that a wine has. The more layers, then the more complexity.
It’s like sandwiches – you can get something simple like a cheese sandwich. The wine equivalent of this would be something like a bog-standard Pinot Grigio.
Something with lots of layers of flavour. A Savennieres, for instance, would be like the chicken & bacon club of the wine world.
Very simply: a wine with tonnes of complexity will smell/taste like something different every time you go back to it.
And the complexity of a wine is a great indicator of quality. More complexity = better wine.
Remember though that quality is not necessarily anything to do with personal preference. A wine can be well made – but that doesn’t necessarily mean you’re going to like it! It’s all subjective.
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