Tools
Export
The Export option is used to export your data in XML format, from your WordPress site. The export format is called WordPress eXtended RSS or WXR and will contain your posts, pages, comments, custom fields, terms, navigation menus and custom posts. ...
Import
The Import option provides you with various tools for importing content from other blogging systems. You can import content from Blogger, LiveJournal, Moveable Type, TypePad and Tumblr. You can also import content from Blogrolls that use the OPML ...
Available Tools
The Available Tools menu option gives you access to the Categories and Tags Converter. The Categories and Tags Converter is a tool for converting Categories to Tags or vice versa. Before it can be used it must be installed via the Import menu option.
Tools
The Tools menu provides some handy administration tools. Most of the time though, they're used when setting up or configuring your WordPress site and so as such, they won’t be covered here in great detail.