What is a callback function?

[Vivek Alampally]

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

Thanks,
Vivek

[Vivek Alampally]

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

Thanks
vivek

[Eric Pascarello]

1) A function that gets called when something is done running
2) Nothing

[David Newton]

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.

[Bear Bibeault]

If you have a copy of jQuery in Action, Appendix A covers this topic in depth.

[Vivek Alampally]

Thank you all for helping me out.