[Dovecot] dovecot/imap-login TLS?

# ps auxwww|egrep -i imap-login dovenull 11879 1.4 0.9 83484 77656 ? S Nov20 19:12 dovecot/imap-login [822 connections (822 TLS)]

What exactly is TLS in this context? All connections from imap -> imap-login? All clients connecting to an imap process?

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