What are session-63629.scope processes?

[Noah]

What are these process?

Jun 11 01:12:01 nuc systemd[1]: Started Session 63629 of user <username>.
Jun 11 01:12:01 nuc systemd[1]: session-63629.scope: Succeeded.
Jun 11 01:12:02 nuc systemd[1]: Started Session 63630 of user <username>.
Jun 11 01:12:02 nuc systemd[1]: session-63630.scope: Succeeded.
Jun 11 01:12:02 nuc systemd[1]: Started Session 63631 of user <username>.
Jun 11 01:12:02 nuc systemd[1]: session-63631.scope: Succeeded.
Jun 11 01:12:02 nuc systemd[1]: Started Session 63632 of user <username>.
Jun 11 01:12:02 nuc systemd[1]: session-63632.scope: Succeeded.

Cheers