Why is the book titled The Outsiders?

In society there are always going to be social groups that are accepted by a society and those that are not accepted.  Hinton, the author, began writing "The Outsiders" when she was only sixteen years old.  Adolescence is a time when children struggle hard to find the social group in which they are accepted.   Some children in modern day society may associated themselves with Goth clothing, body piercings, and/or name brand clothing.  It has always been a social myth that just because a child is a cheerleader, football player, has nice things, and is in the academically promising group, that the child is a benefit to society.  Under the same myth, society looks to the opposite characteristics to stereotype those groups in which the style of dress, group behaviors, lifestyle, and economic status, as being outside of social acceptance.  Hinton titled her book "The Outsiders" to demonstrate that the Greasers were considered to fall into this group.