On the newer iPhone burst mode is a feature in the camera app that takes photos in rapid succession when you hold the shutter button down. I just noticed this by mistake when taking a photo on my iPhone camera with ios7.
If you hold the button down then the camera will take lots of photos in quick succession.
I can imagine it would be great for capturing skateboard tricks or other action shots :)
Hopefully ill remember it and use it form now on rather than getting one crappy blurred image and missing a good one :)