Cloud integrations allow Spacelift to manage your resources without the need for long-lived static credentials. When using infrastructure-as-code automation tools such as Terraform, AWS CloudFormation, or Pulumi, these tools typically require credentials to execute. Usually, these are very powerful credentials, administrative credentials, sometimes. And these can do a lot of damage. Typically, you'd provide those credentials statically - think AWS credentials, GCP service keys, etc. This is dangerous, and against security best practices.
That's why Spacelift integrates with identity management systems from major cloud providers to dynamically generate short-lived access tokens that can be used to configure their corresponding Terraform providers.
This feature is designed for clients using the shared public worker pool. When hosting Spacelift workers on your infrastructure you can use your cloud providers' ambient credentials (eg. EC2 instance role or EKS worker role on AWS).