Talent Review - save or submit buttons

Summary:

What is the difference between the Save and Close button to the Submit button?

After we create a new talent review meeting we can click on the Save and Close button or the Submit button.

I do know that the submit button publishes the meeting to the reviewers and facilitators, they will get a notification and they can prepare the review content. Is that the only difference?

What is the difference between the Save and Close button to the Submit button in the Edit mode?