These are fonts that do not have little diagonal slash marks at the ends of the horizontal lines to make the letters fancy. Font sizes should be between 11-14 points. Avoid italics, script, and underlining words. Avoid any graphics and shading. Do not compress your resume to make it fit on one page.
More white space means a scannable resume.
Use horizontal and vertical lines sparingly. It is best to avoid them entirely, but if you do choose to include a line, make sure there is plenty of room on either side. Use an ink jet or laser printer to ensure a good quality print job. Always send originals. Photocopied resumes lose clarity in the process.