Message Queuing is a method used in computer systems to send and receive messages between different applications or services. It allows these systems to communicate asynchronously, meaning they don't need to be connected at the same time. This helps improve efficiency and reliability, as messages can be stored in a queue until the receiving system is ready to process them. In a Message Queuing system, messages are placed in a queue by the sender and retrieved by the receiver when it is ready. This decouples the sender and receiver, allowing them to operate independently. Popular Message Queuing systems include RabbitMQ and Apache Kafka.