Redshift clusters can have encryption enabled when the cluster is launched. Encryption is considered best practice and can help protect sensitive data. Encryption is also often required by compliance regulations. For more information, see the AWS Documentation.
References:
https://docs.aws.amazon.com/redshift/latest/mgmt/working-with-db-encryption.html
In AWS Console -
In Terraform -
References:
https://docs.aws.amazon.com/redshift/latest/mgmt/changing-cluster-encryption.html
https://registry.terraform.io/providers/hashicorp/aws/latest/docs/resources/redshift_cluster#kms_key_id