Differences between an on-premises and Azure implementation

Interesting comparison from an official Azure documentation article -

On-premises implementation Azure implementation
Networking LAN/WAN SDN (software-defined networking)
Security group IP/port restriction tools Network Security Group (NSG)
Resilience MTBF (mean time between failures) MTTR (mean time to recovery)
Planned maintenance Patching/upgrades Availability sets (patching/upgrades managed by Azure)
Resource Dedicated Shared with other clients
Regions Datacenters Region pairs
Storage SAN/physical disks Azure-managed storage
Scale Vertical scale Horizontal scale

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