Callback

Callback can mean:

• Callback (comedy), a joke which refers to one previously told in a set of jokes including both
• 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
• Web callback, a technology that provides telephone callback for websites