#dnspub enables instant global DNS resolution (except for Turkey) of your npub info. If you have published a kind 0 event for your [npub], the corresponding URIs become globally available within seconds (except for Turkey)

_nip05.[npub].npub.dnspub.xyz
_lud16.[npub].npub.dnspub.xyz
_nip05.[npub].npub.dnspub.xyz
_name.[npub].npub.dnspub.xyz
_display_name.[npub].npub.dnspub.xyz
_website.[npub].npub.dnspub.xyz
_banner.[npub].npub.dnspub.xyz

Why is this a big deal? DNS is baked in at the OS level, so without any additional software, it's possible to find out info about any npub. For example, the npub of @Lyn Alden - resolvable everywhere (except for Turkey)