Take a break from your norm
All applicants wishing to visit Canada must satisfy an officer that they will leave Canada by the end of the period authorized for the stay, that they will not contravene the conditions of admission (for example, that they will not study or work without prior government authorization), and that they do not belong in a category of persons inadmissible to Canada under the Immigration and Refugee Protection Act.
Canadian Government Understands the needs of their permanent residents and in this regard, people whose parents or grand parents live outside of Canada, CIC has launched a program which is called Super Visa by which an individual can invite their parents or grand parents on a long visit for a family re-unite. Rather going on compassionate grounds, Canadian Govt. has decided to check if a person has booked a health insurance policy for their parents or grand parents, which is a major requirement of this program.
Basically it is a long-Term multiple entry visitor visa for the parents or grand parents of a person who is a Permanent resident or Canadian Citizen. Visa is normally granted for 10 years and valid period of stay is 2 years while in normal multiple entry visa the stay is only valid for 2 years