Triggers are automation rules that execute an action when a specific event occurs — for example, starting a welcome drip series the moment someone joins a list. You manage them under Actions → Triggers, where each trigger shows a status toggle, last activity, and how many actions it has performed. Triggers can be reordered by dragging and process in the order shown.
Creating a trigger is a two-step wizard. In Step 1 you pick the event: contact is added to a list (optionally filtered by adding method — manual, API, import, or webform — and by specific lists), contact is added to a segment, or a field value is changed (any field or a specific field, any value or a specific value). In Step 2 you choose when to run — instantly or after a delay (minutes to years) — and the action: send a broadcast, send an admin notification email, start a drip group, change status or email format, update a custom field, move or copy the contact to another list, delete the contact, or add it to a suppression list. Pre-defined templates can be cloned as starting points.
Worth knowing: instant contact-based triggers fire in real time, but delayed and segment-based triggers run on a cron schedule, so the maximum extra delay equals your cron interval; each execution counts toward a monthly action limit, and triggers auto-disable when the limit is reached or a list is blocked; avoid trigger loops where two triggers activate each other.