First of all, the colour. Red wine is produced from black grape varieties. The skin is preserved and remains in contact with the pulp during maceration. It's thanks to the skin and the presence of tannins that the wine has a red colour. The fermentation time differs according to the desired shade. From a few days to several months. So there are light and supple wines, as well as rich and powerful ones. We can differentiate red wines from their tannic power.
The light and supple red wines are delicious and fruity in the mouth. Their colour is clearer, not dark red. The Sancerre, Pinot noir or the Gaillac are light red wines. They go well with charcuterie.
Subsequently, the colour of the more powerful red wines rich in tannin, is very dark red. They are usually quite spicy. Here's an anecdote, the Chambertin was Napoleon's favourite wine!