# How AWS Elemental MediaTailor uses Amazon Secrets Manager
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AWS Elemental MediaTailor is a scalable ad insertion and channel assembly service that runs in the Amazon Web Services Cloud. 

MediaTailor supports Secrets Manager access token authentication to your source locations. With Secrets Manager access token authentication, MediaTailor uses a Secrets Manager secret to authenticate requests to your origin. For more information, see [Configuring Amazon Secrets Manager access token authentication](https://docs.amazonaws.cn/mediatailor/latest/ug/channel-assembly-access-configuration-access-configuring.html) in the *AWS Elemental MediaTailor User Guide*.