What is the significance of the title "The Stranger"?

The title
of the book refers to its main character, Mersault. Only a very naive reader could consider that
the stranger or the foreigner (another possible translation of the French title) is the Arab,
Meursault's victim. Meursault is clearly feeling detached from humanity, which shows at the
beginning of the novel, after his mother has died and he cannot remember the exact date and,
worse, he does not even care.

Although the word "stranger" does not
appear anywhere in the text, it is easy to tell from his own descriptions that Meursault is a
stranger among all the people around him. At the same time, everyone else is a stranger in his
eyes:

Never in my life had I seen anyone so clearly as I
saw these people; not a detail of their clothes or features escaped me. And yet I couldnt hear
them, and it was hard to believe they really existed. (chapter 1)

One could argue that Meursault fails in finding a purpose for his existence. Through
his character's eyes, Camus explores the topics of...

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