On folk-festival ticket-sale morning the App Service site saturates. One teammate wants a larger plan SKU; another wants more instances on the same plan. How should the developer distinguish those two App Service scale actions?
Select an answer to reveal the explanation.
Short Explanation
Scale up is buying a bigger engine; scale out is adding more cars on the same track. App Service uses both axes—SKU for vertical, instance count (and autoscale) for horizontal. Mixing that up with slots or CDN just muddies the morning rush.
Full Explanation
Scale up (vertical) moves the App Service plan to a higher SKU with more CPU, memory, or features. Scale out (horizontal) increases the number of instances running the same app, which autoscale rules can drive. Deployment slots, CDN, and host-platform migrations are separate concerns.