Message Broker

RabbitMQ is an open-source message broker.
Use it because, as a message broker, it handles asynchronous tasks better than web services or REST APIs.
Also, use it because, as a message broker, it helps to decouple your services from one another.
Hence, it eases deployment and maintenance. 

Many SDKs

RabbitMQ is available in different client SDKs.
You can find an actively maintained RabbitMQ SDK for C, DotNet, Erlang, Go, Java, JavaScript, PHP, Python, and other tools and programming languages.
So whatever your stack is you can comfortably use RabbitMQ in your product. 

Community

RabbitMQ is old.
It has a great community and has been continuously maintained by a strong team.
Use RabbitMQ because you are sure of getting support when you encounter any issues with it.
In addition, the team and various community members have created plugins with which you can extend the functionalities of RabbitMQ.

Messaging Protocols

RabbitMQ supports various messaging protocols like AMQP, MQTT, STOMP, etc.
This maximizes the types of services you can connect to RabbitMQ.
Also, using RabbitMQ permits you to easily change your choice message broker to any other broker that can understand the AMQP protocol.

Routing

RabbitMQ has complex routing abilities.
It has exchanges and queues.
When using RabbitMQ, you publish a message to an exchange.
Based on your configuration, the exchange routes the message to a queue.
Subscribers to a queue will then receive the message.
The routing configuration can be simple as specifying just one direct topic.
It can be as complex as using routing keys with regex patterns.
Such a feature is good for large and complex systems.

Analytics

RabbitMQ also has analytics and monitoring features.
Naturally, this is a result of the amount of data that passes through the message broker.
As a result of analytics, you can tell which connected service crashes more often, which one doesn’t respect the expected data signature, and so on. 

In summary, the age, availability, community, routing, and analytics are valid reasons why should use RabbitMQ.