what is 'query_enabled: false'?

While configuring the bungeecord config, I found 'query_enabled: false'.

From https://www.spigotmc.org/wiki/bungeecord-configuration-guide/

query_enabled
Default: false
Type: Boolean
Description: Whether to enable UDP query.

I did not understand yet.
What is this setting? I do not know the word query here. Does anyone have any details about this?

What happens if I change this to true?