Triggers automate calculations that previously would have been done in scripts or with Workflow logic. The calculation is triggered by events to the object (Activate, Modify, and/or Delete) and can either be configured just for the current object or for all objects related to the same parent, depending on where the target attribute is configured.
Triggers will be executed in the order they are listed in Studio, top to bottom. If multiple triggers are configured for the same class and the same events, the first one in the list is executed first. This is important to keep in mind if some triggers depend on others to be calculated first.
Different from calculated attributes, triggers are stored in target attributes in the database and can be used as filter constraints or sorts.