For external access for Azure SQL, we have to update Azure Server Firewall settings in azure portal – i.e. Add client IP. For all granted access add IP range as: 0.0.0.0 – 255.255.255.255
Azure Pricing based on the DTU count.
Instance being controlled and managed by Microsoft.
Higher the DTU count lower will be the latency.
To store large amount of structured data.
Costlier compared to Azure Sql db.
Instance with the user can Stop/Start.