It means "for Girls" The stories have often to focus on the romantic relationships. No matter the popular genres (science fiction, fantasy etc) involve them, there still excites the heart and mind through the emotions to females. Ever Gender genders often appear in the romance/ drama relationships. Addly, the stories are dealing with the problem that the girls and main characters can face in the daily life or activities. There often have the "Pretty Eyes or Big Eyes" too In addition Shojo is Shonen's counterpart,too. I forget to add some of Shojo manga can the mature content. it reads mostly female readers plus it made by mostly female manga artists. Male readers appear to enjoy reading Shojo too.