Amazon S3 provides inexpensive cloud storage while EC2 offers virtual computing resources. S3 allows storage of unlimited data for $0.15 per GB per month with data retrieval priced at $0.10-$0.13 per GB depending on amount. EC2's virtual machines range in power and price from $0.10 per hour for a small instance to $0.80 per hour for an extra large one. Both services offer flexibility to scale up or down on demand with no long term commitments.