What is the primary purpose of AWS Organizations?

The primary purpose of AWS Organizations is to manage and consolidate billing for multiple AWS accounts. This service enables the administration of multiple AWS accounts under a single master account, allowing organizations to streamline their billing processes. By using AWS Organizations, businesses can combine their costs across linked accounts, which can lead to potential cost savings through volume pricing discounts. Additionally, it provides a centralized way to manage policies across these accounts, simplifying governance and operational management. This consolidation is particularly beneficial for companies managing various departments or projects that operate on separate accounts while allowing them to maintain some level of independence.

The other options focus on different aspects of AWS services, with cloud storage solutions and monitoring security gateways being functionalities offered by AWS but not directly related to the main features of AWS Organizations. Providing architectural guidance is also a separate service that AWS might offer through other resources and tools, not specifically linked to the organizational billing and management focus of AWS Organizations.