# ntfy > Send and receive HTTP POST notifications. > More information: . - Send a message to the `security` topic: `ntfy pub security "{{Front door has been opened.}}"` - Send with a title, priority and tags: `ntfy publish --title="{{Someone bought your item}}" --priority={{high}} --tags={{duck}} {{ebay}} "{{Someone just bought your item: Platypus Sculpture}}"` - Send at 8:30am: `ntfy pub --at=8:30am {{delayed_topic}} "{{Time for school, sleepyhead...}}"` - Trigger a webhook: `ntfy trigger {{my_webhook}}` - Subscribe to a topic (`` to stop listening): `ntfy sub {{home_automation}}` - Display help: `ntfy --help`