A use case is taking files from S3 and then doing something with them. It's much easier an efficient to set up a Lambda function that gets "pinged" by S3 every

A use case is taking files from S3 and then doing something with them. It's much easier an efficient to set up a Lambda function that gets "pinged" by S3 every time a new file is uploaded than it is to poll S3 for new files.