Shōjo (少女, shoujo) is Japanese term that means young girl (literally "little female"). Shōjo manga refers to manga marketed to a female audience roughly between the ages of 10 and 18.
Works aimed at this target audience are generally seen as melodramatic stories of romance usually with a female protagonist, and drawn in a flowing style where beautiful characters with huge, intricately drawn eyes become spontaneously surrounded by flowers, stars, and/or bubbles. Shōjo works cover a huge range of subjects, from historical drama to science fiction and by no means do all adhere to the same artistic sensibilities or conventions. Overall, shōjo is not a style or a genre but a target demographic.