In the context of Burgundy wine, 'Grand Cru' and 'Premier Cru' are classifications that indicate the quality and reputation of the vineyard. 'Grand Cru' is the highest classification, denoting wines produced from the most esteemed vineyards in Burgundy. 'Premier Cru', while still excellent quality, is a step below, from vineyards with high but slightly less esteemed reputation. It's like the difference between gold and silver medals!