Proof

A preview version of the artwork which you can check for the purpose of making any necessary corrections before the artwork is printed or sent. Generally, a proof will be in PDF format (except image artworks) and watermarked (except emails) for security reasons.

Screen proof -  an email proofing option that fits the entire email on a single PDF page designed for viewing on a screen.

Print proof - an email proofing option that splits the email across a number of pages designed to be viewed as a printed document.