An action helps to execute specific tasks (see definition). A playbooks is compound of one or more actions.
A connector is a specialized trigger that fetch events and forward them to Sekoia.io. A connector never launches playbook runs.
A module groups a set of triggers and actions sharing a same interest. Most of the time, a module is associated to a product vendor.
A playbook is a recipe aiming to automate recurrent task. It's compound of steps defining a workflow of actions. A playbook always starts with a trigger.
A playbook run represents an execution of the playbook. A run is started by a trigger, after the detection of a new event.
A trigger is the first step of a playbook. The trigger monitors new events and start a new run of the playbook (see definition)