When using Flow Designer, what is the Flow Execution initiated by?

Flow logic elements like conditionals or loops determine the path of execution *within* an already initiated flow, not the initial execution itself.

While a flow can *call* an existing subflow, a subflow itself is a reusable sequence of actions and does not initiate the execution of the parent flow.

Execution data pills are used to pass data between actions *within* an executing flow, but they do not serve as the initiation point for the flow.

Flows in Flow Designer are inherently designed to start with a trigger, which defines the event (e.g., record creation, schedule, inbound email) that initiates the flow's entire execution.