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If you haven't thought much about importing and exporting, it's probably because you don't need to use these features—yet. Many databases are completely happy living a quiet, solitary life. However, importing and exporting might come in handy for a few reasons. Sooner or later, one of these reasons will apply to you.
Exporting's the easier part of the equation. Exporting's simpler than importing, because it involves moving information from a stricter storage location (the database) to one with fewer rules (another type of document).