Which term describes increasing a virtual machine's computing capacity by adding memory or CPUs?

Vertical scaling, also known as "scaling up," involves increasing the resources of an existing virtual machine, such as adding more CPU cores or RAM. This enhances the performance and capacity of that single instance. Agility refers to the ability to respond quickly to changes, which is a general benefit of cloud computing but not a specific scaling method. Horizontal scaling, or "scaling out," involves adding more instances of a resource, like deploying additional virtual machines, rather than upgrading existing ones. Elasticity is the ability to automatically and dynamically scale resources up or down based on demand, but it describes the behavior of scaling, not the specific method of increasing capacity within a single instance.