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+page.title=Overview
+@jd:body
+
+<p>
+Google Play services is a platform delivered by the Google Play Store that offers integration with Google products,
+such as Google+, in Android apps. The Google Play services platform consists of a services component that runs on
+the device and a thin client library that you package with your app. The following diagram shows the interaction
+between the two components:
+</p>
+
+<img src="{@docRoot}images/play-services-diagram.png" />
+
+<p>
+    The Google Play services component is delivered as an APK through the Google Play Store, so
+    updates to Google Play services are not dependent on carrier or OEM system image updates. Newer
+    devices will also have Google Play services as part of the device's system image, but updates
+    are still pushed to these newer devices through the Google Play Store. In general, devices
+    running Android 2.2 (Froyo) or later that have the Google Play Store receive updates within a
+    few days. This allows you to leverage the newest APIs for Google products and reach most of the
+    devices in the Android ecosystem. Devices older than Android 2.2 or devices without the Google
+    Play Store app are not supported.
+</p>
+
+<p>
+    The Google Play services component contains much of the logic to communicate with the specific
+    Google product that you want to interact with. An easy-to-use authentication flow is also
+    provided to gain access to supported Google products, which provides consistency for both the
+    developer and user. From the developer's point of view, requesting credentials is mostly taken
+    care of by the services component through calls to the client library. From the user's point of
+    view, authorization is granted with a few simple clicks.
+</p>
+
+<p>
+    The client library contains the interfaces to call into the services component. It also contains
+    APIs that allow you to resolve any issues at runtime such as a missing, disabled, or out-of-date
+    Google Play services APK. The client library has a light footprint if you use
+    ProGuard as part of your build process, so it won't have an adverse impact on your app's file size. See the
+    <a href="{@docRoot}google/play-services/overview.html">Downloading and Configuring the Google Play services SDK</a> for more
+    information on how to configure
+    <a href="{@docRoot}tools/help/proguard.html">ProGuard</a>.
+</p>
+
+<p>
+    If you want to access added features or products that are periodically added to the client
+    library, you can upgrade to a new version as they are released. However, upgrading is not
+    necessary if you don't care about new features or bug fixes in the new versions of the client
+    library. We anticipate more Google services to be continuously added, so be on the lookout for
+    these updates.
+</p>
+\ No newline at end of file