Until recently I assume they were synonymous π , Here you go to Uni immediatly after finishing HS.
In Canada, the difference is generally that universities offer degrees while colleges offer diplomas and certificates. Degrees generally take longer to earn that diplomas or certificates and would include things like bachelors degrees, masters degrees, PhDs, etc.
But also every university is a collection of colleges. For instance, there will be a college of arts and sciences, a college of engineering, a college of medicine, etc all at a single university