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Google App Engine provides more infrastructure than other scalable hosting services such as Amazon Elastic Compute Cloud (EC2). The App Engine also eliminates some system administration and developmental tasks to make it easier to write scalable applications.
Google App Engine is free up to a certain amount of resource usage. Users exceeding the per-day or per-minute usage rates for CPU resources, storage, number of API calls or requests and concurrent requests can pay for more of these resources.
See a video introduction to Google App Engine:
Learn about all the various products and services that make up the Google Cloud Platform and find out how your organization can benefit from choosing Google's public cloud service.