Producer API:

The Producer API in Kafka allows an application to publish a stream of records to one or more Kafka topics.

Consumer API:

An application can subscribe to one or more Kafka topics using the Kafka Consumer API. It also enables the application to process streams of records generated in relation to such topics.

Streams API:

The Kafka Streams API allows an application to use a stream processing architecture to process data in Kafka. An application can use this API to take input streams from one or more topics, process them using streams operations, and generate output streams to transmit to one or more topics. The Streams API allows you to convert input streams into output streams in this manner.

Connect API:

The Kafka Connector API connects Kafka topics to applications. This opens up possibilities for constructing and managing the operations of producers and consumers, as well as establishing reusable links between these solutions. A connector, for example, may capture all database updates and ensure that they are made available in a Kafka topic.