By packaging a file, you gather the font files. By doing so, if you submit the "ai" file, the font would not be included. The font will be replaced by a red bar. In addition, while independently researching "packaging", you also gather linked graphic files.
To save it, you compress the file and make it into a ".zip" file.
The reason why packaging to the correct location is important is because, if you install it into a file for instances, and you don't include the font file, the font will not be included at all. That's why file organization is important in general.
source: https://www.youtube.com/watch?time_continue=1&v=wxU3USKVsnE
