There are many shades, sizes, and shapes of sweet peppers, but they are not classified by colour. The green, orange, and red colours seen in shops are simply different stages of ripening. Some peppers are bred to be eaten green, and others red, but all peppers will change colour as they mature.

In general, green (or less ripe) peppers have a sharper taste and are usually cooked, whereas ripe red peppers have a sweet and milder flavour, ideal for chopping into salads or adding sweetness to hot dishes.