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What is a callback function?

 
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Hi Can anyone please tell me what a callback function is?

Thanks,
Vivek
 
Vivek Alampally
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And, what is difference between a normal function & callback function? Kindly explain with a example.

Thanks
vivek
 
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1) A function that gets called when something is done running
2) Nothing
 
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Just to add a bit: functions can be passed around in JavaScript. So you can pass a function to another function, which can then call the passed-in function later. Related to this concept are closures. To use JavaScript effectively it's really important to understand how all this works.
 
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If you have a copy of jQuery in Action, Appendix A covers this topic in depth.
 
Vivek Alampally
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Thank you all for helping me out.
 
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