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Auburn is a variety of red hair, most commonly described as reddish-brown in color. Auburn hair ranges in shades from medium to dark. Like brown hair, it is common with a wide array of skin-tones and eye-colors, but as is the case with most red hair, it is commonly associated with light skin features. The chemical pigments that cause the coloration of auburn hair are frequently pheomelanin with high levels of eumelanin.
"Auburn" can be used to describe many shades of reddish hair with similar definitions or hues. It is often conflated in popular usage with Titian hair. While Titian hair is a brownish shade of red hair, auburn hair is specifically defined as including the actual color red. Most definitions of Titian hair describe it as a brownish-orange color, but some describe it as being reddish. This is in reference to red hair itself, not the color red.
Auburn encompasses the color maroon, but so too do chestnut and burgundy. In contrast with the two, auburn is more red in color, while chestnut is more brown, and burgundy is more purple; chestnut hair is also often referred to as "chestnut-brown".
Auburn hair is also found in smaller numbers in Latin America, especially southern Brazil, Argentina and Uruguay. In Argentina and Uruguay, today, auburn hair is quite common but it was very rare at the time of Independence from Spain. Auburn hair in Latin America is common among descendants of Spanish, Portuguese, Italian, French and Northern European (German, Scandinavian, British, Polish, and Russian) immigrants. This color is sometimes seen among the indigenous people of Formosa (Taiwan), but not the later Han Chinese immigrants.