If an employee wants to quit, employers cannot legally require employees to give notice of resignation. Employees can generally quit their job at any time. However, employees who quit are unlikely to be eligible for benefits like Employment Insurance.
If an employee does give notice of resignation, the employer can choose to terminate them sooner, but must pay out the employee for the remaining notice given by the employee, or the amount the employer would have to pay if they decided to terminate them – whichever is less.