Kafka is an enterprise messaging system that allows you to send messages between servers, applications, and processes. It allows you to define topics in which applications can add, process as well as reprocess messages or data.
Applications may interface with this framework and transfer a message onto the given topic. A message can incorporate any sort of data. It could, for instance, have data about an event that has occurred on your site, or it could simply be a basic text message that triggers an event. Another application may interface with the system before processing or re-processing messages from the topic. The information you send is stored in RAM or on the hard drive until the retention period that is specified by you has passed by.
In Kafka, the applications send records to the Kafka broker or node. Further, these messages are processed by other applications that are known as consumers. Then, they are stored in a topic while the consumers subscribe to the topic in order to receive new messages.
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Also, watch this comprehensive YouTube video to know more about Kafka:
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