RDF stands for Resource Description Framework. Files that contain the .rdf file extension are documents that have been written in the Resource Description Framework language. These files are used to store information about the websites that use this file format.
The RDF file format that is used to store this information is called "metadata". The metadata details of an RDF file include details about a website's map, keywords, page descriptions and updates.
The RDF file format is often used by Firefox to store the settings and configurations for certain windows and toolbars that are used within the Firefox browser.
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File.org aims to be the go-to resource for file type- and related software information. We spend countless hours researching various file formats and software that can open, convert, create or otherwise work with those files.
If you have additional information about the RDF file format or software that uses files with the RDF suffix, please do get in touch - we would love hearing from you.