+A **File Extension** is a suffix to a [Filename](/wiki/filename), typically separated by a dot, indicating the nature or [File Format](/wiki/file_format) of a computer file. It helps an [Operating System](/wiki/operating_system) or user understand how to interpret and open the data within.
+## See also
+- [Data](/wiki/data)
+- [Metadata](/wiki/metadata)
+- [MIME Type](/wiki/mime_type)
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