An Azure service that is used to provision Windows and Linux virtual machines.
Why not using "LogShipping"?
No additional service (maybe an Azure storage account for transfering/storing those files) needed, everything is build into SQL Server.
eg doing a TLog backup every 5 min to a URL (Azure SA), an automatically restore those
yeah, there is a con => Supports limited read-only access to secondary databases (during the interval between restore jobs).