This is one of the most important distinctions in Sapera — and in accounting in general.
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.
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.
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.