Software Architect's Handbook

Scalable and flexible

You can't underprovision or overprovision your compute capacity with a serverless architecture. You avoid being in a situation where you do not have enough servers during periods of peak capacity or have too many servers sitting idly during off-peak periods.

The scalability and flexibility of serverless architectures allows for compute capacity to scale up and down as demand changes. You only use as much compute capacity as you need and you are charged for the amount that you use. Wasting compute capacity is kept to a minimum and organizations will experience lowered costs as a result.