If you are just starting out with Amazon Web Services, it is important to understand AWS pricing models explained for beginners to avoid unexpected charges. AWS offers different pricing models: On-Demand, Reserved Instances, and Spot Instances. A blog post on perfsys.com explains these AWS pricing models simply and clearly. On-Demand — pay only for what you use, ideal for short projects. Reserved Instances are beneficial for long-term use — you reserve resources in advance and save up to 75%. Spot Instances allow you to purchase unused resources at a reduced price, but they can be revoked at any time. For beginners, it is important to first analyze your needs and choose the best option.