What is the pricing model that AWS customers can use to pay for resources on an as-needed basis?

The pricing model that allows AWS customers to pay for resources on an as-needed basis is referred to as "Pay as you go." This model provides significant flexibility, enabling users to only pay for the services and resources they actually utilize. With this approach, AWS customers can dynamically scale their usage based on demand without being tied to long-term contracts or commitments.

This model is particularly beneficial for organizations with variable workloads, as it helps manage costs effectively by allowing them to adjust resource consumption based on current needs. Additionally, it eliminates the need for upfront capital expenditures, making it easier for businesses to adapt their cloud strategy as their requirements evolve.

The other pricing models mentioned, such as annual subscription, fixed pricing, and bulk pricing, often involve commitments or predetermined costs that may not align with the fluctuating demands typical in cloud environments.