SFP Module: What's It and How to Choose It?

What Is An SFP Module And What Is It Used For sfp slot Case analysis: This is about connecting 1000Mbps switches on the same rack SFP port is used instead of RJ45 port which can cause electrical interference sfp slot How to check connected SFP module Serial no Part No type and Info? Apart from these command? I tried these command but can't grab required

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