Fonts are normally installed inputer operating systems (OS) such as Windows or macOS. Any font installed in your OS can be used in any app. When you create and edit documents the app refers to the font file installed in your OS. The font isn part of the document file so when the document is opened in an app on a differentputer the app tries to reference the font file in thatputer OS. If the same font isn installed it has to pick a different one. Most apps will use one default serif font for any missing serif font and one default sans-serif font for any missing sans-serif font. The only way to ensure a document appears the same way on otherputers is to the font file in the document. This isn done as standard because it would infringe the copyright in the font. If everyone swapped fonts freely in document files nobody would buy fonts. Most of the time in practice people swap Microsoft Word documents using fonts installed as standard in Microsoft Windows so theirputers all have the same font files. Adobe PDF document format offers a way to fonts legally ensuring theyre only used to render the document and can be extracted for infringing use. So if you want to share a document with fonts intact export it as a PDF (most apps support this) ensuring any option to include fonts is ticked. Recipients will always see the fonts rendered correctly. This isn a good workaround if your recipients need to edit the document because PDF is a format intended for viewing not editing. The only way to share an editable file that includes custom fonts is to also give the recipient the relevant font files from your OS which they can then install on theirputer before opening the document. This is fine if the fonts are copyright-released for distribution such as Google Fonts. In any other case you would be infringing copyright. In Windows 1 you can right-click on a font in Control Panel Fonts and Copy then Paste the font file elsewhere (perhaps into an email). To add it to theirputer the recipient can right-click the font file and choose Install. On a Mac open the Font Book app click Computer find a font in the list right-click and choose Show in Finder. You can drag this font file to another location or into an email. The recipient can double-click the file to preview and install it. Although various font formats exist most fontse as TrueType (TTF) or OpenType (OTF) files which will work on both Windows PCs and Macs.