Every Otaku of just about any degree knows that there are different styles of manga and anime. Each style is noticeably different when one is placed next to the other. Bishoujo and Shonen are both examples.
However, the one I'm going to discuss isn't a style so much as it's a targeted demographic. The "style" is Shoujo and it's target audience are young ladies aged 10 to 18. As a matter of fact, this audience is where Shoujo derives it's name. Originally, it comes from the Chinese characters meaning "young/few/or little" and "Girl." The first magazine to target this audience in Japan was called "Shoujo" and was printed in the early 20th century.
It encompasses everything that school-age girls find interesting, such as fashion, hobbies, reading material, etc. Focusing on many subjects such as school, home, and romantic situations that characters get into. It even has a male fan following in Japan and wherever it is sold.
So, if your a young lady in America, and you would like to see what young ladies in Japan are reading, doing, wearing, you should check these magazines out. If for no other reason than some fun education!