Which two situations require a data type?

These two situations require a data type. A data type is a reusable component that defines the structure and behavior of a set of data in your application. You can use data types to access and write data from and to external systems of record, such as databases or web services. You can also use data types to populate fields with values from your application data, such as drop-down lists or radio buttons. References: https://community.pega.com/knowledgebase/articles/data-management-and-integration/86/creating-data-types