Account
The Alibaba Cloud account. In Message Service (MNS), an account ID is used to identify an Alibaba Cloud account.

Queue-based MNS services

Queue owner
After activating MNS for your Alibaba Cloud account, you can use the CreateQueue operation to create a queue. The Alibaba Cloud account is the queue owner and is authorized to perform all operations on the queue. You can view the account ID of a queue owner on the Alibaba Cloud official website.
Producer
The client that sends messages to a queue.
Consumer
The client that receives messages from a queue.

Topic-based MNS services

Topic owner
After activating MNS for your Alibaba Cloud account, you can use the CreateTopic operation to create a topic. The Alibaba Cloud account is the topic owner and is authorized to perform all operations on the topic.
Publisher
The client that publishes messages to a topic.
Subscriber
The client that receives messages from a topic.