There are four types of post statuses in CoSchedule.
Published - Scheduled - Pending Review - and Draft
Published - post is live and viewable on your site or on the social network
Scheduled - the post will go live at the appointed date and time
Pending Review - the post is waiting on review and will NOT publish even if the date/time arrive as it is not 'ready' yet and hasn't been reviewed.
Draft - Works in progress. Posts that aren't finished. Drafts will NEVER publish to your blog. Once you finish the draft you need to set the status as Scheduled in order to make it publish automatically.