> For the complete documentation index, see [llms.txt](https://notebook.iuriioapps.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://notebook.iuriioapps.com/cloud/aws/application-services/swf.md).

# SWF

Amazon SFW is a web service that makes it easy to coordinate work across distributed application components. SWF enables application components. SWF enables applications for a range of use cases, including media processing, web application backends, business process workflows, and analytics pipelines, to be designed as a coordination of tasks.

Tasks represent invocations of various processing steps in an application which can be performed by executable code, web service calls, human actions and scripts.

#### SWF Actors

* **Workflow starters** - an application that can initiate (start) a workflow.
* **Deciders** - control the flow of activity tasks in a workflow execution. If something has finished (or failed) in a workflow, a decider decides what to do next.
* **Activity workers** - carry out the activity tasks.

### SQS vs SWF

* SQS has a retention period of up to 14 days, with SWF workflow executions can last up to 1 year.
* SWF represents a task-oriented API, whereas SQS offers a message-oriented API.
* SWF ensures that a task is assigned only once and is never duplicated. With SQS, you need to handle duplicate messages.
* SWF keeps track of all the tasks and events in an application. With SQS, you need to implement your own application-level tracking, especially if your application uses multiple queues.


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