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You're reading a README, editing documentation, or writing notes in Obsidian. The file is Markdown — a formatting syntax so simple that most people can read the raw source without knowing it's a markup language. Headings start with #, bold uses **, links are [text](url), and that's enough to write most documents.
John Gruber and Aaron Swartz designed Markdown in 2004, and it quietly conquered the developer world. GitHub READMEs, Reddit posts, Discord messages, Notion pages, Jekyll blogs, Stack Overflow answers, and most technical documentation are all Markdown. The format converts to HTML with zero friction, which is why it became the default for anything that lives between plain text and a fully formatted document.
Any text editor opens .md files. VS Code has built-in Markdown preview. Obsidian and Typora ($15) provide polished editing experiences. For simple documents, you don't need a special editor at all — Markdown's entire point is that the source text is human-readable. If your document needs tables, footnotes, or complex layouts, most Markdown flavours support them with slight syntax extensions.