“Champagne” gets used loosely to mean almost any sparkling wine, but the real definition is much narrower – and it’s protected by law. Knowing the actual rules makes it a lot easier to understand why a bottle costs what it costs.
It has to come from Champagne, France
Only sparkling wine made in the Champagne region of northeastern France, from approved grapes (mainly Chardonnay, Pinot Noir, and Pinot Meunier), can legally be called Champagne anywhere in the EU and much of the world. Everything else – however good – is technically “sparkling wine,” whatever the label might imply.
The method is the other half of the story
Champagne must also be made using the traditional method: a second fermentation that happens inside the actual bottle you’ll eventually open, which is what creates those fine, persistent bubbles. This process is slow, labour-intensive, and a big part of why Champagne carries a premium over wines made with quicker, cheaper methods.
So what does that make everything else?
Prosecco, Cava, Crémant, and California “champagne-style” sparkling wines can all be excellent – they’re just playing a different game, with different grapes, regions, and often different production methods. None of that makes them lesser wines; it just means they’re not actually Champagne, strictly speaking.