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A vCPU Is a Rented Hardware Thread, Not a Dedicated Core

Every cost estimate, every scaling decision and every thread-count setting downstream in this curation is denominated in vCPUs. If the learner believes a 16-vCPU machine gives 16 cores of throughput, their predicted cost and predicted runtime are both wrong before any other reasoning starts, which directly breaks the outcome's 'costs roughly what they predicted'.

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Virtual CPU Allocation and Scheduling by a Hypervisor in Server Virtualization

A virtual CPU (vCPU) is a software-constructed abstraction of a physical processor, created by a hypervisor and assigned to a virtual machine, representing a share of real processing capacity rather …