Is it necessary to add the source of .ogg extension to videos?

Question

every example demonstrated has it after the URL source has been added. Any idea why?

Answer 1

because of differences in PCs operating system

the extension of ogg usually was recognized by pcs which is running Linux os, while the rest are mainly for windows

Answer 2

Yes, it should be added.

https://code.sololearn.com/W183LdZ9cmUp/?ref=app