This is one of the most important distinctions in Sapera — and in accounting in general.
Draft
A draft is a working copy. Here you can enter, edit and check without affecting the accounts yet. Think of it as a workspace where things are allowed to be in progress.
Posted
When you post the draft, the entries become final and settle into the accounts. You do not edit posted entries directly — instead you make a counter-entry (for example a credit note). That is what makes a set of accounts reliable and traceable.
Why the difference matters
You can work calmly in a draft until it is right.
Once something is posted, you can trust the figures — but must correct via counter-entries, not by deleting.
Read more in Posting drafts and Posting archive.