This document defines key terms related to page layout and design in desktop publishing, including: - Margins, bleed, and slug which refer to the negative space and extra space around pages. - Grids and guides which are visual aids for aligning objects without appearing on the final document. - Facing pages and master pages which relate to page layout features for print documents. - Character and paragraph styles which allow applying formatting consistently. - Justification and text flow terms like overflow, widows/orphans, and breaks which describe how text is formatted within and across pages.