Amazon EMR is a managed Hadoop framework that makes it easy and fast to do mass data processing. EMR is great for handling tasks like log analysis, web indexing, data transformations (ETL).
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Remember that S3 doesn’t know about subfolders/subdirectories. A slash is just a slash. There’s only one level of folders called buckets. Inside buckets are files, called objects (aka keys)
Instead, S3 uses a Prefix to filter the list. Only keys with a matching prefix are displayed.
S3 also allows a delimiter with the --delimiter=X or -d (to use / as the delimiter)