What is one difference between SaltStack and Ansible?

SaltStack operates on a master-minion architecture, where a Salt master controls Salt minions (agents) running on managed devices. This allows for real-time communication and high-speed execution. Ansible, on the other hand, is agentless and primarily uses YAML for defining playbooks and configurations. While Ansible can use SSH for communication, its core configuration and automation logic are expressed in YAML. The other options are incorrect: SaltStack does not use an Ansible agent or an API proxy agent in that manner, nor does Ansible rely on a Telnet server or an event bus for its primary communication with devices.