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How are stouts related to mild ales?

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Six small glasses of craft beer in varying amber and golden hues are arranged on a metal tray atop a wooden bar counter in Brussels, Belgium. — Beer Glasses of beer in a bar in Brussels.

In the context of brewing, stouts are characterized as stronger versions of mild ale.12

While mild ales are traditionally defined as being weaker, darker, and sweeter than other styles like bitter, they achieve their color through the use of special malts, roasted barley, or caramels. Stouts share this dark profile but are distinguished by their higher strength. Historically, the term "stout" itself was used to denote a "stouter" or stronger version of a beer style; for instance, early strong dark beers were often referred to as "stout porters".213

Today, the relationship between these styles is part of a broader brewing tradition where distinctions based on raw materials and methods have evolved, though stouts remain recognized for their heavier body and increased alcohol content relative to the milder, lighter-bodied ales.12