The Adobe PDF Settings page shows the conversion settings that you can specify for your sources to use. You can use any of the predefined PDF settings or create your own. The PDF settings determine precisely how files are converted and their resultant PDF structure and features. Adobe PDF settings were previously known as Distiller® parameters or job options.
About the predefined PDF settings
PDF Generator provides several predefined PDF settings for your use. You cannot modify these predefined settings; however, you can create a setting based on an existing one by editing the setting and saving it under a new name.