Answer: Amazon S3

Amazon S3 (Simple Storage Service) is AWS's object storage service that offers scalable storage for data lakes, cloud-native applications, and backup/archive. **Key differences between the options:** - **Amazon S3**: Object storage service for storing and retrieving any amount of data - **Amazon RDS**: Relational database service for SQL databases - **Amazon EFS**: Elastic file system for shared file storage - **Amazon DynamoDB**: NoSQL database service Object storage stores data as objects with metadata and unique identifiers, making it ideal for unstructured data like documents, images, and videos.

Author: Ritesh Yadav