A font is a particular style of text, like ‘Helvetica’ or ‘Times’.
Sometimes you might make a keynote presentation on one computer, but then you copy it to a different computer, and it doesn’t display properly. This may be because the font you used is not on the second computer. A font is not included in a document when you save it. If the new computer doesn’t have the right font, it won’t be able to display your text properly. It will try to substitute a different font, which may not look good! This means if you are using a strange font, you may need to copy the font to the new computer. Here’s how.