Currently, most visitors to Canada may visit for up to six months when they first enter Canada. Visitors who wish to stay longer must apply for an extension, and pay a new fee.
With the parent and grandparent super visa, eligible parents and grandparents can visit family in Canada for up to two years without the need to renew their status.
The Super Visa is a multi-entry visa that provides multiple entries for a period up to 10 years. The key difference is that the Super Visa allows an individual to stay for up to two years at a time in Canada, while a 10-year multiple entry visa would only have a status period for each entry of six months only.
There are also specific requirements that you must meet to be able to get a super visa. See the IRCC website for who can apply for a grandparent super visa or Who is eligible for a parent and grandparent super visa?