How systems notify each other of events in real time — a payment completing, a form being submitted — without one system having to constantly poll the other for changes.
Why I use it
Removes the delay and wasted requests of polling for changes on a schedule
The standard way payment gateways, CRMs, and SaaS tools broadcast events
Where it fits
Syncing data the moment it changes in Stripe, a CRM, or a form tool
Triggering automations (email, Slack notification, database update) from an external event