When ending a sentence with a question mark (?) you are asking the person or people you are talking to a question for which you would like an answer. Here you are asking permission to do a particular action.

Here are some examples:

Can I answer your question?
Can I attend the event?
Can I move to another spot?
Can I call you tomorrow?
Can I complete this later?
Can I explain myself?
Can I help you with your homework?
Can I include you in our plans?
Can I introduce you to my co-workers?
Can I inform you of some bad news?

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