# Triggers of a flow

### Overview <a href="#overview" id="overview"></a>

Every flow needs to be started with a trigger, be it a time trigger, a webhook trigger, an AS2 trigger, a flow trigger or an API Gateway trigger, as this will define how and when the flow will be executed.

Below is the documentation for each type of trigger:

* [API Gateway trigger](/english/skyone-studio/integrations/flows/triggers-of-a-flow/api-gateway-triggers-adding-and-setting.md)
* [AS2 trigger](/english/skyone-studio/integrations/flows/triggers-of-a-flow/as2-triggers-adding-and-setting.md)
* [Queue trigger](/english/skyone-studio/integrations/flows/triggers-of-a-flow/queue-triggers-adding-and-setting.md)
* [Flow trigger](/english/skyone-studio/integrations/flows/triggers-of-a-flow/flow-triggers-adding-and-setting.md)
* [Time trigger](/english/skyone-studio/integrations/flows/triggers-of-a-flow/time-triggers-adding-and-setting.md)
* [Webhook trigger](/english/skyone-studio/integrations/flows/triggers-of-a-flow/webhook-triggers-adding-and-setting.md)


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