Question

what are compiler directives

Answer 1

Hello friend here is your answer.
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Source lines that should be handled by the preprocessor, such as #define and #include are referred to as preprocessordirectives. Another C construct, the #pragma directive, is used to instruct the compiler to use pragmatic or implementation-dependent features.
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Answer 2

Answer:

In computer programming, a directive or pragma (from "pragmatic") is a language construct that specifies how a compiler (or other translator) should process its input. Directives are not part of the grammar of a programming language, and may vary from compiler to compiler.