It is a unique visitor’s visa available for relatives of Canadian citizens and permanent residents of Canada. A typical visitor’s visa in Canada only gives permission to visit the country for 6 months.

A parents super visa is not the same, it is a multi-entry visa and gives permission to stay as long as 5 years and it also allows you to apply for a 2-year extension. Once a person gets approval for a super visa, it is valid for 10 years.

Super visa requirements:
There are few requirements for super visa eligibility in Canada. In order to be eligible for a super visa the applicant should:

Be the parent or grandparent of a Canadian citizen or Canadian permanent resident
Be able to present a letter of invitation by their child or grandchild that ensures they will provide financial support for the visa-holder while they are staying.
Have proof from their relative showing they have the necessary minimum income to provide for the applicant’s stay in Canada
Submit a copy of their relative’s Canadian passport or Permanent Resident Card (PR Card).
Do a medical exam to show proof they are medically admissible in Canada
Provide documents showing they have essential medical insurance by a Canadian insurance company; this is sometimes known as a super visa insurance

An important requirement of super visa eligibility is that the applicant needs to have an in-force super visa health insurance policy from a Canadian insurance company. Super visa insurance is a specific type of travel insurance policy that gives coverage of all the criteria of the super visa application process and residency requirements.
For more info : https://www.travelance.ca/