RabbitMQ is an open-source message broker that facilitates communication between applications through message queuing. It implements the Advanced Message Queuing Protocol (AMQP), making it a versatile choice for various programming languages. By acting as an intermediary, RabbitMQ decouples application components, allowing them to communicate asynchronously and efficiently. This is particularly useful in scenarios where tasks require significant processing time, as it prevents the main application from being blocked. With features like a user-friendly administration interface and cross-platform compatibility, RabbitMQ is widely deployed in modern software architectures to enhance scalability and reliability in message handling.