The 3-Year Rule
Married to Canadian citizen? You can get PR in 1 year (spousal sponsorship fast-tracked). Then after 3 more years of PR: eligible for citizenship. Total: 4 years instead of 5.
Process
Spouse sponsors you (financial support required). You become PR. Clock starts. 3 years as PR → citizenship eligible.
Alternative: Common-Law
Common-law partners (cohabiting 1+ year): same benefits. Marriage not required but long-term commitment recognized.