Supporting documents provide the evidence that backs up your application or argument.  They play a crucial role in any immigration process.  All documentation needs to be translated to one of the two official languages in Canada, English or French.  Relevant documents will vary according to the case and they need to be legitimate. The types of documents you will need are in general, birth certificates, marriage certificates, degrees, transcripts, medical reports, divorce certificate, police certificates, statutory declarations, and many more.