What is the LD_PRELOAD trick?

Question

I came across a reference to it recently on proggit and (as of now) it is not explained.

I suspect this might be it, but I don\'t know for sure.

Answer 1

when LD_PRELOAD is used that file will be loaded before any other $export LD_PRELOAD=/path/lib lib to be pre loaded, even this can be used in programs too