Vertical vs. Horizontal Scaling Architecture

High availability means your applications are designed to stay running even if parts of the system fail. Azure achieves this by spreading resources across multiple, physically separate locations called datacenters within a region. If one datacenter has a problem, traffic automatically flows to another. This setup reduces downtime and keeps services accessible to users. Scalability is the ability of a system to handle changes in demand. You can add more resources, like processing power or memory, to handle growth. This is called scaling up. You can also add more copies of a resource, like adding more virtual machines to a pool, which is called scaling out. The cloud makes scaling fast and easy, so you only pay for what you need when you need it.