You have no doubt seen a picklist in action—one of those drop-down lists that provide a selection of valid values. The Force.com platform picklist data type allows you to specify the values for the picklist and displays the object in the appropriate user interface.
There are several places in your application that cry out for picklists to guide your users to correct data values.
In the Position object, these fields require only a limited set of values:
Department - departments in Universal Containers
Education - levels of educational attainment
Status - progress of the position towards being filled
The Candidate object also has an opportunity for a picklist
Education -specifies the maximum level of education for this ...