Two mqtt brokers

Sorry if I sound a complete noob but I am confused about the MQTT in my

I see a MQTT broker in configuration>integrations as

but I also see a MQTT broker in my supervisor> dashboard running ( )

they’re both running but I don’t remember setting up the supervisor one.

Is this normal? Which one should I use? Should I remove one? Is there any specific advantage of using one over the other?

Thank you for helping me understanding.

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Te top one is the integration to connect Home Assistant to the MQTT Broker, the bottom one is the actual MQTT Broker, which you installed as an add-on for Home Assistant. You need both in order to have MQTT in Home Assistant.
The clients connect to the MQTT Broker and the integration is used to make Home Assistant a client of the MQTT broker.