Volatile keyword in c

C's volatile keyword is a qualifier that is applied to a variable when it is declared. It tells the compiler that the value of the variable may change at any time--without any action being taken by the code the compiler finds nearby.

Why volatile keyword is used for?

Using volatile  Keyword is yet another way (like synchronized,
atomic wrapper) of making class thread safe. Thread safe
means that a method or class instance can be used by 
multiple threads at the same time without any problem.

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