Message brokers are also called queues, busses.
Kafka, RabbitMQ, MQtt
https://www.youtube.com/watch?v=aj9CDZm0Glc&ab_channel=IBMTechnology https://www.youtube.com/watch?v=Ch5VhJzaoaI&ab_channel=JamesCutajar https://www.youtube.com/watch?v=W4_aGb_MOls&ab_channel=HusseinNasser https://www.youtube.com/watch?v=PzPXRmVHMxI&ab_channel=StephaneMaarek https://www.youtube.com/watch?v=7rkeORD4jSw&ab_channel=IBMTechnology