AWS Lambda
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AWS Lambda [1] is a compute service that runs code in response to events and automatically manages the compute resources required by that code. The purpose of Lambda, as opposed to Amazon Elastic Compute Cloud (EC2), is to simplify building smaller, on-demand applications that are responsive to events and new information. AWS targets starting a Lambda instance within milliseconds of an event.
AWS Lambda was designed for use cases such as image upload, responding to website clicks or reacting to output from a connected device. AWS Lambda can also be used to automatically provision back-end services triggered by custom requests.
Unlike Amazon EC2, which is priced by the hour, AWS Lambda is metered in increments of 100 milliseconds.