How is MQTT applied to MQ queuing applications, or how do you understand them?

MQTT (: Message Queuing Telemetry Transport (message queuing Telemetry Transport Protocol)
message queuing (MQ): is used for asynchronous processing, application decoupling, traffic trimming, and so on.

so I have the following questions: 

 1:mqtt"message queuing" 
 2:MQ:
 rabbitmq,mqtt
 3:PHPer
 
 (;) 
    MQtask
    1
Mqtt mq
Mar.21,2022

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MySQL Query : SELECT * FROM `codeshelper`.`v9_news` WHERE status=99 AND catid='6' ORDER BY rand() LIMIT 5
MySQL Error : Disk full (/tmp/#sql-temptable-64f5-1be0753-31506.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1be0753-31506.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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