Apache Kafka is a distributed, partitioned commit log service that acts as a messaging system with unique features. It is designed to collect, hold, and dispense enormous amounts of data. A Kafka-centric microservice architecture refers to an application setup where microservices communicate with each other using Kafka as an intermediary. This model offers several advantages over traditional monolithic architectures, including scalability, reliability, and security. Key reasons for choosing Apache Kafka at the heart of a microservice architecture include its extensive ecosystem, easy integration with existing systems, fault tolerance and scaling through clustering, advanced access control, and ability to store and process any content.