A picklist is a dropdown list that provides users with a list of valid values to select from. Filtered picklists contain more complexity and reference other lists in a model: the driver and filter lists. Selections made in a driver list determine what users can select in a filter list.
One-to-many filtered picklists map single list items in a driver list to multiple list items in a filter list. For example, Senior Director in the Role list qualifies for Plan B and Plan C in the Compensation Plan list.