Which AWS service is primarily used for scalable object storage?

Amazon S3, or Simple Storage Service, is the primary AWS service designed for scalable object storage. It allows users to store and retrieve any amount of data from anywhere on the web. Its architecture enables users to store vast amounts of data in a flexible, scalable, and cost-effective way. S3 automatically scales to accommodate your storage needs without requiring any prior resource allocation or management, making it ideal for applications requiring dynamic storage capacity.

S3 is known for features such as data durability, high availability, and security options tailored to meet compliance needs. Furthermore, it supports various storage classes, enabling cost optimization based on retrieval frequency and access patterns, making it a versatile choice for different use cases such as backup, data archiving, and hosting static websites.

Other services listed do not serve the same purpose as Amazon S3. For instance, Amazon RDS is designed for relational database management, while Amazon EC2 offers virtual server hosting, and Amazon CloudFront is a Content Delivery Network (CDN) service that helps deliver content with low latency. Each of these services meets different requirements altogether, but for scalable object storage, Amazon S3 is the dedicated solution.