I know it is not a standard data type
Yes, its standard (described in <stddef.h>)
wchar_t
Integral type whose range of values can represent distinct wide-character codes for all members of the largest character set
specified among the locales supported by the compilation environment:
the null character has the code value 0 and each member of the
Portable Character Set has a code value equal to its value when used
as the lone character in an integer character constant.
But in C I don't understand how it works similar to basic data type.
Use the functions and macros of wchar.h header
solved how wchar_t data type working c? [closed]