API reference documentation
- Host-specific APIs provide strongly-typed objects that can be used to interact with objects that are native to a specific Office application.
- Common APIs can be used to access features such as UI, dialogs, and client settings that are common across multiple types of Office applications.
You should use host-specific APIs whenever feasible, and use Common APIs only for scenarios that aren't supported by host-specific APIs. For more detailed information about these two API models, see Building Office Add-ins.