Questions about application in firewall

[man2020a]

Good day! Today I upgraded and KDE turned into a MATE. It’s forever?

charon appeared in the firewall.
Please explain what it is

[I_Have_Treasure (We can't help everyone, but everyone can help someone.)]

Charon is an IPsec IKEv2 daemon which can act as an initiator or a responder.
It is written from scratch using a fully multi-threaded design and a modular
architecture. Various plugins can provide additional functionality.

for more Information visit : Charon - IPsec IKEv2 daemon

[man2020a]

Thanks, cool !