Kafka vs MQTT: What are the differences?
Developers describe Kafka as "Distributed, fault tolerant, high throughput pub-sub messaging system". Kafka is a distributed, partitioned, replicated commit log service. It provides the functionality of a messaging system, but with a unique design. On the other hand, MQTT is detailed as "A machine-to-machine Internet of Things connectivity protocol". It was designed as an extremely lightweight publish/subscribe messaging transport. It is useful for connections with remote locations where a small code footprint is required and/or network bandwidth is at a premium.
Kafka and MQTT can be primarily classified as "Message Queue" tools.
Kafka is an open source tool with 12.7K GitHub stars and 6.81K GitHub forks. Here's a link to Kafka's open source repository on GitHub.
Uber Technologies, Spotify, and Slack are some of the popular companies that use Kafka, whereas MQTT is used by Pubu, Jaumo, and Danale Inc. Kafka has a broader approval, being mentioned in 509 company stacks & 470 developers stacks; compared to MQTT, which is listed in 12 company stacks and 6 developer stacks.