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|Registration||Required (included in free tier layer)|
|Launched||March 14, 2006|
Amazon S3 (Simple Storage Service) is a cloud computing web service offered by Amazon Web Services (AWS). Amazon S3 provides object storage through web services interfaces (REST, SOAP, and BitTorrent). Amazon launched S3 on its fifth publicly-available web service and in November 2007 in Europe.
Amazon says that S3 uses the same scalable storage infrastructure that Amazon.com uses to run its own global e-commerce network.
Amazon S3 is reported to store more than 2 trillion objects as of April 2013 This is up from 10 billion as of October 2007, 14 billion in January 2008, 29 billion in October 2008, 52 billion in March 2009, 64 billion objects in August 2009, and 102 billion objects in March 2010. S3 uses include web hosting, image hosting, and storage for backup systems. S3 guarantees 99.9% monthly up-time service-level agreement (SLA), that is, not more than 43 minutes of downtime per month..
Amazon does not make details of S3's design public, though it manages data with an object-storage architecture. According to Amazon, S3's design aims to provide scalability, high availability, and low latency at commodity costs.
S3 is designed to provide between 99.999999999% durability and 99.99%-99,95% availability of objects over a given year depending on which Amazon S3 Storage classes are used, though there is no service-level agreement for durability.
The basic storage units of Amazon S3 are objects which are organized into buckets (each owned by an Amazon Web Services account), and identified within each bucket by a unique, user-assigned key. Amazon Machine Images (AMIs) which are used in the Elastic Compute Cloud (EC2) can be exported to S3 as bundles.
Buckets and objects can be created, listed, and retrieved using either a REST-style HTTP interface or a SOAP interface, but new Amazon S3 features will not be supported for SOAP, Amazon recommends use either the REST API or the AWS SDKs.
Bucket names and keys are chosen so that objects are addressable using HTTP URLs:
http://bucket/key(where bucket is a DNS CNAME record pointing to bucket.s3.amazonaws.com)
Because objects are accessible by unmodified HTTP clients, S3 can be used to replace significant existing (static) web-hosting infrastructure. The Amazon AWS Authentication mechanism allows the bucket owner to create an authenticated URL with time-bounded validity. That is, someone can construct a URL that can be handed off to a third-party for access for a period such as the next 30 minutes, or the next 24 hours.
Every item in a bucket can also be served up as a BitTorrent feed. The S3 store can act as a seed host for a torrent and any BitTorrent client can retrieve the file. This drastically reduces the bandwidth costs for the download of popular objects. While the use of BitTorrent does reduce bandwidth, AWS does not provide native bandwidth limiting and as such users have no access to automated cost control. This can lead to users on the "free-tier" S3 or small hobby users amassing dramatic bills. AWS representatives have previously stated that such a feature was on the design table from 2006 to 2010 but in 2011 stated the feature is no longer in development.
Amazon S3 offers four different storage classes designed for different use case depending on durability, availability and performance requirements. Amazon S3 Standard and Reduced Redundancy Storage (RRS) , Amazon S3 Standard Infrequent Access (IA), Amazon S3 One Zone Infrequent Access and Amazon Glacier which is designed for data archiving.
Amazon S3 pricing varies depending on the different S3 storage classes, prices varies from storage usage, number of requests and data transfers. At its inception, Amazon charged end users US$ 0.15 per gigabyte-month, with additional charges for bandwidth used in sending and receiving data, and a per-request (get or put) charge. On November 1, 2008, pricing moved to tiers where end users storing more than 50 terabytes receive discounted pricing. As of July 2018, the price for the first 50 Tb ranges from $0.023 to $0.0405 per Gb per month, depending on choice of location of storage.
Amazon S3 provides options to host static websites with Index document support and error document support. This support was added as a result of user requests dating at least to 2006. For example, suppose that Amazon S3 was configured with CNAME records to host http://subdomain.example.com/. In the past, a visitor to this URL would find only an XML-formatted list of objects instead of a general landing page (e.g., index.html) to accommodate casual visitors. Now, however, websites hosted on S3 may designate a default page to display, and another page to display in the event of a partially invalid URL.
Photo hosting service SmugMug has used S3 since April 2006. They experienced a number of initial outages and slowdowns, but after one year they described it as being "considerably more reliable than our own internal storage" and claimed to have saved almost $1 million in storage costs.
There are various User Mode File System (FUSE)-based file systems for Unix-like operating systems (Linux, etc.) that can be used to mount an S3 bucket as a file system. Note that as the semantics of the S3 file system are not that of a Posix file system, the file system may not behave entirely as expected.
Apache Hadoop file systems can be hosted on S3, as its requirements of a file system are partially met by S3. As a result, Hadoop can be used to run MapReduce algorithms on EC2 servers, reading data and writing results back to S3.
Netflix uses Amazon Web Services for their storage and compute operations with S3 being their system of record. Netflix implemented a tool, S3mper, to address the limitations of eventual consistency that Amazon S3 provides. S3mper stores the filesystem metadata: filenames, directory structure and permissions in Amazon DynamoDB.
Dropbox,Bitcasa, and Tahoe-LAFS-on-S3, among others, use S3 for online backup and synchronization services. In 2016, Dropbox moved out from using Amazon S3 services and developed its own cloud server.
S3 was used in the past by some enterprises as a long term archiving solution, until Amazon Glacier was released in August 2012.
The API has become a popular method for object storage. As a result, more and more applications have been built to natively support the S3 API. This includes applications that write data to AWS S3, as well as to S3-compatible object stores:
|Client Backup||Haystack Software LLC||Arq backup|
|Client Backup||CloudBerry Lab||CloudBerry Backup|
|Client Backup||Novosoft LLC||Handy Backup|
|MySQL Backup||Oracle||MySQL Enterprise Backup|
|Oracle Database Backup||Oracle||Oracle Secure Backup Cloud Manager|
|Server Backup||Atempo||Digital Archive (ADA)|
|Server Backup||Asigra||Asigra Cloud Backup|
|Cloud Storage||Wasabi||Wasabi Hot Storage|
|Cloud Storage Gateway||CTERA Networks||C00 Series|
|Cloud Storage Gateway||Avere||FXT Series|
|Cloud Storage Gateway||EMC||CloudArray|
|Cloud Storage Gateway||Microsoft||StorSimple|
|Cloud Storage Gateway||Nasuni||NF Series|
|Cloud Storage Gateway||NetApp||Altavault|
|Cloud Storage Gateway||Panzura||Global File System|
|Sync & Share||Storage Made Easy||SME|
|Hybrid Storage||Cloudian||Cloudian HyperStore|
|Hybrid Storage||NooBaa||NooBaa Storage|
|On-Premises Storage||Pure Storage||FlashBlade|
|On-Premises Storage||Scality||RING Storage|
|Open Source||Zenko.io||Open Source S3 Server|
Amazon S3 allows users to enable or disable logging. If enabled, the logs are stored on Amazon S3 buckets which can then be analyzed. These logs contain useful information like,
S3 API allows operations on different components of Amazon S3 solution such as, Buckets, Objects and the Service.
The broad adoption of Amazon S3 and related tooling has given rise to competing services based on the S3 API. These services use the standard programming interface; however, they are differentiated by their underlying technologies and supporting business models. A cloud storage standard (like electrical and networking standards) enables competing service providers to design their services and clients using different parts in different ways yet still communicate and provide the following benefits:
Examples of competing S3 compliant storage implementations
Amazon S3 provides an API for third-party developers. It describes various API operations, related request and response structures, and error codes. The original AWS Console provides tools for managing and uploading files, but it is not capable of managing large buckets or editing files online. Third party websites like S3edit.com or Cloudberry Explorer software can help edit files on S3. 
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