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How to ask a question about computer hardware (spesific part) to know its name and functionality?

Recently, I asked this question: What is a name of this port? And for what purpose can it be used?

I also provided a picture and its the best thing to tell what I am asking about. However, the question marked as off-topic.

I am really confused because I can't edit the question content to make it on topic, can you please help me in this context.

Thanks