Callback

Callback can mean:

Callback (computer programming), executable code that is passed as a parameter to other code
Callback (telecommunications), the telecommunications event that occurs when the originator of a call is immediately called back in a second call as a response
Callback verification, a method for e-mail address verification used in SMTP
Callback (comedy), a joke which refers to one previously told in a set of jokes including both
Callback (film), a 2005 film
Web callback, a technology that provides telephone callback for websites
In theater, film, or other performing arts, a follow-up after an audition or a casting, in which directors can further audition candidates for a position or part

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