> ## Documentation Index > Fetch the complete documentation index at: https://doc.callupgrade.ai/llms.txt > Use this file to discover all available pages before exploring further. # Building Flows > Flow consists of two parts, trigger and actions ## Trigger The flow's starting point determines its frequency of execution. There are various types of triggers available, such as Schedule Trigger, Webhook Trigger, or Event Trigger based on specific service. ## Action Actions come after the flow and control what occurs when the flow is activated, like running code or communicating with other services. In real-life scenario: Flow Parts