what document is that and for what purpose?

Usually, u bring your original documents together with the copies of the documents to the place u intending to apply for, then, that place got someone to certified for u, foc....

example, if i want to use it for apply for university admission, i bring original and copies of it to uni or college i apply, pass it to admission officer, they will certify it for free.

Same goes to job application, pass it to HR or recruitment consultant, on the spot they chop and sign for u