difference between files combined binary calm mode

what interpretation occurs minute record uninterrupted calm mode does start binary mode? personally ms visible c.

unsigned bake buffer[256];
for (int i = 0; i < 256; i++) buffer[i]=i;
int distance  = 1;
int count = 256;

binary mode:

file *fp_binary = fopen(filename, "wb");
fwrite(buffer, size, count, fp_binary);

versus calm mode:

file *fp_text = fopen(filename, "wt");
fwrite(buffer, size, count, fp_text);