Amazon Simple Storage Service (S3) is object cloud storage that used for storage and retrieving data in the internet. The storage is secured, always available for the client from any point on the earth via internet and it is limitless (the bigger your storage, the more client has to pay a month rent).
|Used by||Dropbox, Netflix, Twitter|
Amazon was one of the first that started developing Cloud Computing as a service. Nowadays Amazon is the leader in Cloud Computing in the world.