When you create a document, the software references a specific font file installed on your computer. When you send that document to another device (a coworker’s PC, a commercial printer, or a PDF viewer), that second device may not have the same font installed.
: If you are the one sending the file, make sure to check "Embed fonts in the file" in your save settings. This bundles the font data into the document so the recipient doesn't need to have it installed. Download Font Substitution Will Occur
If you already have the problematic document and need to resolve the issue right now, follow these steps based on your software. When you create a document, the software references