Shōnen manga (少年漫画, lit. "boys' comics", also romanized as shonen, shounen or syônen) is an editorial category of Japanese comics targeting an audience of adolescent boys. It is, along with shōjo manga (targeting adolescent girls and young women), seinen manga (targeting young adult and adult men), and josei manga (targeting adult women), one of the primary editorial categories of manga. Shōnen manga is traditionally published in dedicated manga magazines that exclusively target the shōnen demographic group. Of the four primary demographic categories of manga, shōnen is the most popular category in the Japanese market. While shōnen manga ostensibly targets an audience of young males, its actual readership extends significantly beyond this target group to include all ages and genders. The category originated from Japanese children's magazines at the turn of the 20th century and gained significant popularity by the 1920s. The editorial focus of shōnen manga is primarily on action, adventure, and the fighting of monsters or other forces of evil. Though action narratives dominate the category, there is deep editorial diversity and a significant number of genres and subgenres within shōnen manga, especially when compared to other comic cultures outside of Japan, including comedy, crime, romance, slice of life, and sports. Source: Wikipedia (en)