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What is AWS Step Functions?
This revision card explains What is AWS Step Functions? A bank loan app needs many Lambdas in order — score , then fraud , then approve. Hand-written chaining is hard to watch and retry. It describes step Functions is a managed workflow — you draw or write states that call Lambda, wait, choose, and retry. The how-to section covers how to create a state machine (ASL JSON or Workflow Studio) , then grant it invoke rights , then start an execution with input JSON. An example on the card is console graph shows each step green/red; failed step can retry without redoing the whole loan flow.
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What this card says
Why do we need it?
A bank loan app needs many Lambdas in order: score → fraud → approve. Hand-written chaining is hard to watch and retry.
What is it?
Step Functions is a managed workflow: you draw or write states that call Lambda, wait, choose, and retry.
state machine
How to do it
Create a state machine (ASL JSON or Workflow Studio) → grant it invoke rights → start an execution with input JSON.
Example
Console graph shows each step green/red; failed step can retry without redoing the whole loan flow.