systemd-resolve-daemon [OpenNIC Wiki]

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Since Debian 13 ”Trixie”, the resolv.conf is generated by the systemd-resolved, the systemd Resolver Daemon.

To get an overview over the currently configured resolvers we run the resolvectl command:

root@machine:~# resolvectl
Global
         Protocols: +LLMNR -mDNS -DNSOverTLS DNSSEC=no/unsupported
  resolv.conf mode: stub
       DNS Servers: 127.0.0.1 ::1

Link 2 (eth0)
    Current Scopes: DNS LLMNR/IPv4 LLMNR/IPv6
         Protocols: +DefaultRoute +LLMNR -mDNS -DNSOverTLS DNSSEC=allow-downgrade/supported
Current DNS Server: 127.0.0.1
       DNS Servers: 127.0.0.1 ::1
     Default Route: yes

The section Global refers to a configuration which is used if no other configuration is provided. The section eth0 refers to a configuration used for that particular interface.