I think all the Cisco Meraki switches have a management port except the 8 port models (might be wrong about the 8 port models). The management port runs a DHCP server, and is designed for you to be able to plug a computer into to configure the rest of the switch enough to be able to get a connection to the Meraki cloud. From there everything else is configured via the dashboard. You would not plug the management port into the rest of your network.
To be more specific, the management IP address of a Meraki switch is used primary for connecting to the Meraki cloud.
This page outlines what can be done via the management IP address.
https://documentation.meraki.com/zGeneral_Administration/Tools_and_Troubleshooting/Using_the_Cisco_M...