
All of those are demograhics. Shounen manga = for young boys, shoujo manga = for young girls, and josei manga = for adult women.
Imo the definitions aren't rigid, so you'll get shounen manga that's more catered towards women, and josei manga that's more catered towards men, so it's not that important to distinguish between the three.

It’s really about the magazines they are published and the age demographics, but it’s not totally rigid. For example, people tend to think of shojo as sirupy, over dramatic romance, but things like Natsume Yuujincho is a shojo becaus it runs in a shojo magazine, even though it’s really not too romance heavy. Another example is Legal Drug. Originally it ran n a shojo magazine, then when it came back from hiatus, it came back as a seinen, because it now ran in a seinen magazine.
can someone explain the difference between Shounen, Shoujo and especially Josei… it’s so confusing?? ⁄(⁄ ⁄·⁄ω⁄·⁄ ⁄)⁄