Glossary term
What is Ack (Acknowledgement)?
Ack stands for Acknowledgement.
"I received / processed this." Example: Worker acks after sending the email.
Learn it properly · System DesignLesson 18: Message Queues: A Gentle IntroductionPlacing an order shouldn't wait on the email provider — or fail because SMS is down. How message queues let you do the essential work now and everything else reliably a moment later, with acks, retries, dead-letter queues and back pressure.