Biometrics has proven itself over the years since it has been implemented by some of our partner countries. It's a way of anchoring an identity by matching certain biometric information, such as a photograph, fingerprints, or an iris scan, to biographical information like name, date of birth, etc., so identity can be established the first time an individual seeks to apply for a visa or enter Canada.
If that person is issued a visa, when they appear at the port of entry determination can be made whether the person who appears is the same person who was actually issued the visa. Identification can be run against databases to check for impersonation, or to see whether the individual has actually appeared before with a different identity.
Those are a couple of examples of how the integrity of the process and the security of Canada can be protected through the use of biometrics.