What is this __default__ user?

Question

Red Hat Enterprise Linux

The output of the semanage login -l command did not confuse me much
In addition to the root user, there were two more users
__default__
system_u
What are these users?

Answer 1

the special system_u account (which doesn't exist - it is a special definition for system daemons)
the special __default__ account (which doesn't exist) which plays the role of the catch-all account
https://wiki.gentoo.org /wiki/SELinux/Tutorials/Def...