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Visual stdio [c] - RANA - 11-28-2010

i have always used scanf but now just recently dont know maybe it was updated or something it gives a warning whenever i use scanf() and it instead asks me to write scanf_s() well what is the reason of this and it says to stop seting it i need to disable deprecation.
What is it and why is it.
Any one having any thoughts about it and wanting to share??