What is the meaning of the official transcript?
If this is about graduate admission, universities normally require an official transcript (i.e. NOT a copy). An official transcript normally carries the signature of the Registrar, is in color, and is put in an sealed envelop prepared by the Registrar's office.

Some US universities require that your transcript comes directly from the Registrar's office of your institution, while some would accept one that you send in as long as it's inside the sealed envelop prepared by the registrar's office.