Guest Statuses Explained
Short answer
Pending: invitation not sent yet. Invited: invitation sent. Confirmed: guest said yes. Declined: guest said no. Checked in: guest arrived.
Pending: Invitation not sent yet. Invited: Invitation sent. Confirmed: Guest RSVP'd yes. Declined: Guest RSVP'd no. Checked In: Guest arrived. No Show: Confirmed but didn't attend.