SlideShare uses Amazon Web Services like S3, EC2, and SQS to handle its large storage and computing needs. It stores all presentations on S3 for secure and public access. It moved its conversion system to EC2 instances to gain scalability and reliability over unstable on-premise servers. It uses SQS as an inexpensive and reliable messaging channel between its hosting services and EC2 conversion cluster. It also takes advantage of Spot Instances which are less than half the price of regular EC2 instances.