What is 'trusted certificate'

[Kamil Jońca]

I have freeradius server configured to use EAP-TLS
(certificate baset authn)
Since some time I have warning in logs:

--8<---------------cut here---------------start------------->8---
Fri Jul 15 22:29:04 2022 : Warning: (TLS) untrusted certificate with depth [1] subject name /C=PL/ST=Mazowieckie/L=Warszawa/O=beta/OU=wifi/CN=beta-wifi-ca
Fri Jul 15 22:29:04 2022 : Warning: (TLS) untrusted certificate with depth [0] subject name /C=PL/ST=Mazowieckie/O=beta/OU=wifi/CN=salamandra
--8<---------------cut here---------------end--------------->8---

I took a look into code and it seems to be related to
"X509_STORE_CTX_get0_untrusted(ctx)" function.
I tried to search, but without success.
Can anyone tell me when certificate is "trusted" in this context?
(How to get rid this warning) or point to documentation/search keys

KJ

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