Renditions are important for the platforms in which devices have multiple dimensions. For example, the iPad is available in 1024x768 (SD or Standard Definition) and 2048x1536 (HD or High Definition) dimensions, and popular Android devices include 1024x600, 1280x800, 1920x1200, and 2560x1600 formats.
When you publish folios, using the same Folio Name creates a rendition. While Folio Name values for the different renditions must be the same, the Size values must be different (except for a Web Viewer Only rendition). In addition, if the folio renditions belong to a retail app, we recommend that you use the same Product ID for all renditions (but use different Product IDs for different sets of renditions). For renditions in a subscription app, the Publication Date values must be identical—choose the date from the calendar widget.