The Wikipedia Search plugin integrates Wikipedia and other Wikimedia projects into Obsidian, allowing users to quickly search, link, and open articles directly within their notes. Key features include linking articles in various languages, inserting descriptions, introductions, and thumbnails, and creating notes from Wikipedia content. Users can also hyperlink selected text and customize inserts with templates. Articles can be viewed in Obsidian using the Surfing plugin, enhancing accessibility and integration of external knowledge into personal note-taking workflows.