General message is a basic message type, where a message is delivered to the specified topic by the producer and then consumed by the consumer subscribed to the topic. As general messages are not sequential in a topic, you can use multiple partitions to improve the message production/consumption efficiency, and they deliver the best performance when the throughput is huge.
General message is different from scheduled, delayed, sequential, and transactional message. The topics corresponding to these types of messages cannot be mixed and can only be used to send and receive messages of the same type. For example, a general message topic can only be used to send and receive general messages but not other types of messages.