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Outlaw-type units (Wildwest, Wokou, Maratha, etc) are recruited much faster and gain more attack and hitpoints with each Age-up.
—In-game description

Folk Heroes is a technology in Age of Empires III: Definitive Edition that can be researched by European civilizations at the Tavern in the Fortress Age since update 23511. Once researched, it increases the hit points and attack of outlaw units by 20% and decreases their train time by 50%.

It also further increases the hit points and attack of outlaws and Treasure guardians by 30% in the Industrial Age, and 50% in the Imperial Age.

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