its allow users to use animation or move avatars
like here
https://www.f-iraq.com/vb/threads/%D8%AA%D8%BA%D8%B1%D9%8A%D8%AF%D8%A7%D8%AA-%D8%A8%D9%86%D9%83%D9%87%D8%A7%D8%AA-%D9%85%D8%AE%D8%AA%D9%84%D9%81%D8%A9-_.32627/page-2315
like here
https://www.f-iraq.com/vb/threads/%D8%AA%D8%BA%D8%B1%D9%8A%D8%AF%D8%A7%D8%AA-%D8%A8%D9%86%D9%83%D9%87%D8%A7%D8%AA-%D9%85%D8%AE%D8%AA%D9%84%D9%81%D8%A9-_.32627/page-2315