What is the key feature of Aurora?

The key feature of Aurora is its fully managed and relational database service. Aurora is part of Amazon Web Services and is designed to deliver the performance and availability of high-end commercial databases while being compatible with open-source databases like MySQL and PostgreSQL. This fully managed aspect means that AWS handles routine database tasks such as provisioning, patching, backup, recovery, and scaling, allowing users to focus on application development instead of database administration.

The relational nature of Aurora allows it to use structured query language (SQL) for querying data and ensures data integrity through traditional relationships, making it suitable for a wide range of applications. Its architecture also provides automatic replication and high availability, contributing to its reliability and robustness.

Other options do have other characteristics, but they don't capture the essence of what makes Aurora unique as a database service within the cloud infrastructure. For instance, while open-source frameworks and document-oriented structures are relevant for certain database systems, they do not fundamentally describe Aurora, which centers around relational capabilities and managed services. Similarly, while distributed architecture is included in many modern database systems, it is the fully managed nature that primarily distinguishes Aurora in this context.