How do I connect my iMac to an external hard drive using a Thunderbolt port cable?
Thunderbolt port cable for my iMac to an external Hard Drive
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depending on the imac model then you will need a thunderbolt 3/4/5 cable which use usb-c connectors
Adapters for the Thunderbolt or USB-C port on your Mac - Apple Support
if it's an old imac then you will need a thunderbolt 1/2 cable which use minidisplayport connectors
you connect it by plugging the cable into the imac and the other end into the external drive you wish to connect