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permalink(PERMAnent LINK) A unique URL assigned to a blog or news clip posting by blog or syndication software that remains permanent for that article. It is common to routinely move old blog postings and news articles to different parts of the site. Without a permalink, all external references in documentation and on websites to these articles become invalid.
The permalink is made up of a base URL combined with elements such as date, time, names and numbers or just a unique number. Using an index, the site keeps track of the physical location of the article and converts the permalink to that address. See deep link and OpenURL.