Which AWS service provides a scalable object storage solution for data archiving?

Amazon Glacier is specifically designed as a scalable object storage service that focuses on data archiving and long-term storage. It is optimized for infrequently accessed data and offers a low-cost solution for storing massive amounts of data that do not need to be accessed quickly. The primary use case for Glacier is to store data in a secure, durable manner while minimizing costs for storage that is rarely retrieved, making it ideal for compliance, backup, or disaster recovery scenarios.

Unlike other options, such as Amazon S3, which is a more general-purpose storage solution that supports frequent access and various storage classes including archival solutions, Glacier specifically targets long-term data archiving with features like retrieval policies that control how quickly archived data can be accessed.

Amazon EBS provides block storage primarily for use with Amazon EC2 instances, which is more suited for data that requires low-latency access and high performance, and is not tailored for archiving purposes. Amazon RDS, on the other hand, is a managed database service meant for relational databases, completely unrelated to object storage or archiving functions.

Therefore, when considering the specific need for scalable object storage geared towards data archiving, Amazon Glacier stands out as the appropriate solution.