update docs

Signed-off-by: NAnnie_wang <annie.wangli@huawei.com>

en/application-dev/database/database-datashare-overview.md

@@ -4,6 +4,8 @@
 
 The **DataShare** module allows an application to manage its own data and share data with other applications. Currently, data can be shared only between applications on the same device.
 
+**DataShare** must be used together with [DataShareExtensionAbility](../reference/apis/js-apis-application-dataShareExtensionAbility.md).
+
 Data needs to be shared in a wealth of scenarios. For example, contacts, short message service (SMS), and media gallery always needs to be shared. However, certain data, such as accounts and passwords, cannot be shared. Some data, such as SMS messages, can be queried but not modified by other applications. **DataShare** provides a secure data sharing mechanism for applications in a variety of scenarios.
 
 The data provider can directly use the **DataShare** framework to share data with other applications without complex encapsulation. The data consumer only needs to learn and use a set of interfaces because the data access mode does not vary with the data provisioning mode. This greatly reduces the learning time and development difficulty.
@@ -16,11 +18,11 @@ Before you get started, familiarize yourself with the following concepts:
 
 - Data provider
 
-  An application that provides data and implements related services. It is also called a producer or server.
+  The **DataShareExtensionAbility** based on the stage model implements functions, such as selectively adding, deleting, modifying, and querying data, and opening files. It implements services related to cross-application data sharing.
 
 - Data consumer
 
-  An application that accesses the data or services provided by a data provider. It is also called a client.
+  The data consumer uses **DataShareHelper**, a utility class created by [createDataShareHelper()](../reference/apis/js-apis-data-dataShare.md#datasharecreatedatasharehelper), to access the data provided by the data provider.
 
 - **ValuesBucket**
 
@@ -41,7 +43,7 @@ Before you get started, familiarize yourself with the following concepts:
 
 ![](figures/en_DataShare.png)
 
-- The **DataShareExtAbility** module, as the data provider, implements data sharing between applications.
+- The **DataShareExtAbility** module, as the data provider, implements services related to data sharing between applications.
 - The **DataShareHelper** module, as the data consumer, provides interfaces for accessing data, including adding, deleting, modifying, and querying data.
 - The data consumer communicates with the data provider using inter-process communication (IPC). The data provider can be implemented through a database or other data storage.