# AWS

## Connecting to S3

Accern AI platform allows users to connect to their S3 buckets for sourcing as well as delivering data.

To connect to the S3 buckets, there are 2 mechanisms:

1. **Cross-Account Role :** This is a preferred and more secure option for enabling connection to S3. Accern uses a Cloud Formation template to generate a unique URL per client account. This provides details of the Accern's AWS Account ID, an External ID that is unique per client account a list of permissions required to connect to the S3 buckets. Additional details about this connection mechanism are available at <https://docs.aws.amazon.com/IAM/latest/UserGuide/id_roles_create_for-user_externalid.html>
2. **Access Key Id and Secret Access Key :** This is less preferable option as in this case, the client provides access key id and secret access key to connect to the S3 buckets.


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