c - What's meaning of "EXPORT_SYMBOL" in Linux kernel code?

Question

from here

 48 struct snd_card *snd_cards[SNDRV_CARDS];
 49 EXPORT_SYMBOL(snd_cards);

I am not getting whats the meaning of it and why that is used. I tried to search about it but not understanding the meaning of that.

Answer 1

It makes a symbol accessible to dynamically loaded modules (provided that said modules add an extern declaration).

Not long ago, someone asked how to use it.