The documents required for Canadian visit visa are:

A valid passport
Two recently taken photographs
Non-refundable application fee and IMM 5401 receipt
Proof of sufficient funds to visit Canada

You may also require other Documents like:
Proof of identity
Proof of Employment
Letter of invitation
Travel documents

All detail information on Canadian visit visa is available here:
http://www.cic.gc.ca/English/visit/apply-how.asp

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