Markdown
Markdown is a lightweight markup format that turns plain text into formatted documents using simple symbols (# for headings, ** for bold, [text](url) for links). Writers, developers, and bloggers love it because the source file stays human-readable and converts cleanly into HTML, PDF, or Word. It is the native format of GitHub READMEs, Notion exports, and Obsidian notes.
PDF
PDF (Portable Document Format) freezes a document’s exact layout so it looks identical on every device. It is the contract, invoice, eBook, and academic-paper format of record. PDFs can hold text, vector graphics, raster images, forms, and digital signatures — but editing them outside specialized tools is painful, which is why PDF-to-Word is one of the most-searched conversions.