Visitor visa is a temporary permit. It is therefore very important that the visa officer must be satisfied that the applicant will leave Canada after the visit. The refusal rate of visitor visa is high because it really is not easy to prove the intent to return. In addition to the supporting documents that the CIC lists in their check list, there is a number of documents that you should include with your application to improve your chances to be approved.
If you have a relative in Canada, they can send you invitation. This invitation must be supported by several documents, showing their ability to support you while you are in Canada, in addition to those documents that you will have to provide to prove your ability and willingness to return to your home country.
If you plan to apply for visitor visa, contact us before you start. We will help you prepare an application that has a fair chance to succeed. It is extremely important that you do not misrepresent your intentions.