When a big company has many AWS accounts (dev, prod, finance, HR etc.), managing all of them separately — setting up security, policies, compliance — is a huge task.

Control Tower automates all of that. It sets up and governs a secure, compliant multi-account AWS environment in a few clicks, following AWS best practices automatically.

It uses AWS Organizations under the hood to create and manage all the accounts.

Benefits

• Set up your entire multi-account environment in a few clicks
• Automatically manage policies across all accounts using guardrails
• Detect policy violations and fix them automatically
• Monitor everything from one interactive dashboard

Guardrails — How Control Tower Enforces Rules

A guardrail is simply a rule that applies automatically across all your accounts.

Two types:

Preventive Guardrail

Stops something from happening in the first place. Uses SCPs (Service Control Policies) to block actions before they occur.

Example: Restrict all accounts from deploying resources outside allowed regions. Nobody can do it — it's blocked upfront.

Detective Guardrail

Doesn't block — but watches and alerts when something wrong happens. Uses AWS Config to continuously monitor resources.

Example: Detect resources that have no tags across all member accounts.