what is local_unbound? (services option presented during install)

[mrjayviper]

as above.
preface: I'm know my unix stuff but networking is something I'm not familiar with.

1. I've searched the net and it seems it's something to do with running a local DNS server?
2. Any situation why I need to run it? (other than the fact I may want to run a DNS server if my assumptions are correct)

Thanks

 

[ondra_knezour]

From local-unbound(8)

It uses a built in list of authoritative nameservers for the root zone
(.), the so called root hints. On receiving a DNS query it will ask
the root nameservers for an answer and will in almost all cases receive
a delegation to a top level domain (TLD) authoritative nameserver. It
will then ask that nameserver for an answer. It will recursively
continue until an answer is found or no answer is available (NXDOMAIN).
For performance and efficiency reasons that answer is cached for a
certain time (the answer's time-to-live or TTL). A second query for
the same name will then be answered from the cache. Local-unbound can
also do DNSSEC validation.

So basically this allows you to use DNS locally without relying on what your ISP provides.