Here is what the Pages User Guide says:
" Exporting Pages Documents to Other File Formats
If you want to share your Pages documents with those who aren’t using the latest version of Pages, you can export your document to file formats that they may be able to use on their computers or other devices:
• PDF: You can view PDF files in iBooks, and view or print them in Preview and Safari. You can edit them with a PDF application. Fonts used in the Pages document are preserved in the PDF file.
Hyperlinks in your Pages document are exported to the PDF file. Hyperlinks are also created in the PDF file for table of contents entries, footnotes and endnotes, webpages, email addresses, and bookmarks.
• Microsoft Word: You can open and edit Microsoft Word files in Microsoft Word on a computer running Mac OS X or Windows.
Because of text layout differences between Microsoft Word and Pages, an exported Word document may contain a different number of pages than its Pages counterpart. You may notice other differences, as well, for example, table layouts and some special typographic features may not be identical. Some graphics (particularly those using transparency) may not display as well. Charts created in Pages appear as MS Graph objects, which you can edit in Microsoft Word.
• RTF: You can open and edit RTF files in many different word processors. RTF files retain most of the text formatting and graphics.
• Plain text: You can open and edit plain text files in many text editing applications, such as TextEdit. Exporting to plain text removes all document and text formatting, and images aren’t exported. ePub: You can open ePub files for reading in the iBooks application on an iPad, iPhone, or iPod touch, or in any ePub file reader. After you export your document to ePub format, you must transfer it to your device to read it in iBooks. To learn more about optimizing a document for ePub format, exporting it, and transferring it to your device, see “Creating an ePub Document to Read in iBooks” on page 257.
If your Pages document is password-protected, the password-protection is removed from the new file that's created upon export. However, if you export to the PDF file format, you can apply a new password at the time of export. "