Summary
Azure SQL is a very complex and extended service that works in a similar way to its on-premises version, Microsoft SQL Server. While being a full PaaS Azure component, it still allows for many advanced operations such as sharding, multi-tenancy, AD integration or failover, and geo-replication. Besides being hosted in within a cloud provider's infrastructure, you can still use it in the same way you would a standalone version of SQL Server.
In the next chapter, we will cover the last PaaS service mentioned in this book, which is Azure Data Lake Storage (ADLS).