When we use #include<stdio.h>, the compiler will look at the
compiler's directory for stdio.h file and then include it.
When we use #include"stdio.h", it will look in the source
code's directory for the stdio.h file.

"" are basically used when the header file is placed with
the source code(means .c or .cpp files), not in the C
Compiler's 'include' directory. It is basically used to
include our own self generated header files into our program.