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Note

This topic doesn't apply to most mobile use cases. If you're using the iOS SDK or Android SDK, see [Initialize a mobile SDK](🔗), which describes getting the datafile and instantiating a client.

Once you have a datafile, you can instantiate an Optimizely client. Any time you retrieve an updated datafile, just re-instantiate the same client.

For simple applications, all you need to provide to instantiate a client is a [datafile](🔗) specifying the project configuration for a given environment. For most advanced implementations, you'll want to [customize the client](🔗) for your specific requirements.

There are several other optional parameters for configuring the Optimizely client. See the [Customize an SDK](🔗) and the API reference sections.