The object of information-sharing is to support the effective administration and enforcement of Canada’s citizenship and immigration programs including, but not limited to, such matters as:
• travel to Canada, authorization to enter into Canada, the investigation of matters relating to program abuse, criminality, public safety and health, the coordination and streamlining of enforcement cases and the sharing of services and facilities, i.e., those used for detention purposes;
• the selection of foreign nationals, issuance of visas, protection of refugees, integration of newcomers, support of provincial and territorial immigration programs and settlement services;
• the support of Canada’s public safety and security objectives with respect to the management of the global movement of people and combating international terrorism, war crimes, crimes against humanity and organized crime.
Info sharing can be done with departments and agencies within Canada or with countries with which Canada has a agreement.
See
https://www.canada.ca/.../policies.../agreements.html