Microsoft AZ-900 Exam - Topic 1 Question 129 Discussion

One of the major changes that you will face when you move from on-premises cloud to the public cloud is the switch from capital expenditure (buying hardware) to operating expenditure (paying for service as you use it). This switch also requires more careful management of your costs. The benefit of the cloud is that you can fundamentally and positively affect the cost of a service you use by merely shutting down or resizing it when it's not needed.

https://docs.microsoft.com/en-us/azure/architecture/cloud-adoption/appendix/azure-scaffold