The DropDownList loads the data either from the local data sources, or remote data services that is is through the dataSource property. It supports the data type of array or DataManager. The DataManager that act as an interface between service endpoint and DropDownList, will require the below minimal information to interact with the service endpoint properly. DataManager-url - Defines the service endpoint to fetch data DataManager-adaptor - Defines the adaptor option. By default, ODataAdaptor is used for remote binding. Adaptor is responsible for processing response and request from/to the service endpoint. @syncfusion/ej2-data package provides some predefined adaptors that are designed to interact with the particular service endpoints. They are: UrlAdaptor - Use this to interact any remote services. ODataAdaptor - Use this to interact with OData endpoints. ODataV4Adaptor - Use this to interact with OData V4 endpoints. WebApiAdaptor - Use this to interact with Web API created under OData standards. WebMethodAdaptor - Use this to interact with web methods. In this sample, the local data is bound to a collection of sports data, and the remote data is bound to a collection of customer data as an instance of DataManager. More information on the data binding feature configuration can be found in the documentation section.