What does manga mean??

Manga (Japanese: 漫画 are comics created in Japan, or by Japanese creators in the Japanese language, conforming to a style developed in Japan in the late 19th century.They have a long and complex pre-history in earlier Japanese art.

In Japan, people of all ages read manga. The medium includes works in a broad range of genres: action-adventure, romance, sports and games, historical drama, comedy, science fiction and fantasy, mystery, suspense, detective, horror, sexuality, and business/commerce, among others.Since the 1950s, manga has steadily become a major part of the Japanese publishing industry .

Manga-comics are divided into many different types, or genres. These are:

1. Doujinshi 

This type of manga translates as "fan-work" (literally "same-person-writing") 

Doujinshi is unofficial manga that is made and produced by fans of an original series, or a self-published manga

2. Gekiga
Gekiga means "dramatic pictures". This type of manga is more experimental or literary. 

3. Hentai This manga is sexually hardcore manga. Hentai is Japanese for "perverted" or "perversion". (adult content)

4. Josei
Josei is manga aimed at adult women. (adult content). It is derived from the English "Lady Comic"

5. Seinen
Seinen (literally "adult") is the exact same thing as Josei except for males. (adult content) 

6. Shōujo （少女）
Shōujo (literally "young girl"), Not Shōjo(処女）, shojo means virgin、 is manga aimed at young females up to the age 18. These series tend to focus on romance and relationships from a young female's point of view. 

7. Shonen
This is almost the same as shojo except it is mostly action, sports or romance for males up to age 18. It translates literally as "boy". 

Source: Wikipedia and Wikia