Why is the novel entitled The Outsiders?Kindly provide textual evidence.

The title can refer to the fact that the two gangs, the
Socs and the greasers, are on the edges of society.

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 The rich Socs "jump greasers and wreck houses
and throw beer blasts for kicks, and get editorials in the paper for being a public
disgrace one day and an asset to society the next." The poor greasers, conversely,
"steal things and drive old souped-up cars and hold up gas stations and have a gang
fight once in a
while."

 There is an irony in
the fact that both gangs are outsiders from society and are yet vehement in their
dislike of each other: making members of one gang outsiders from the other. Cherry and
Ponyboy go some way to bridging the gap, but with very limited
success.

Maybe
the two different worlds we lived in weren't so different. We saw the same
sunset.

Outsiders can also of
course refer to the ordinary citizens who do not really touch the gang members, who
remain outside the rules and codes of gang warfare. This would include Mr. Wood, the
teacher at the Windrixville fire, and Mr. Syme, Ponyboy's English
teacher.