"for example, a developer could write a function that extracts metadata from image files and generates thumbnails for them, then set it to be triggered automatically every time a new image is uploaded to S3. Previously, doing so would have required spinning up one or more EC2 instances, complete with full application stacks. With AWS Lambda, the same can be achieved with just a few lines of code, with Amazon taking care of the gritty details of provisioning, scaling, and maintenance." Amazingly, Amazon is providing a generous free tier too. Starting tech startups keeps getting easier and easier.

This should be Lambda.