[C][C++] Why do some structures end with an array of size 1 or 0?

Why do some structures end with an array of size 1? - blog"The Old New Thing"
Stackoverflow - Array of zero length
cppreference - remove_extent

Internal reference:
[C++ / C][NOTE] The Lost Art of C Structure Packing by Eric S. Raymond

• Using of zero size array in a structure mainly due to padding.