In Ontario, Canada, obtaining a driving license involves a graduated licensing system, which consists of three main stages: G1, G2, and finally, the full G license.

Here's a breakdown of each stage:

1. G1 License (Class G1)
   - Eligibility: Individuals must be at least 16 years old, pass a written knowledge test about the rules of the road and traffic signs, pass a vision test, and have parental consent if under 18.
   - Restrictions:
   - Must drive with a fully licensed driver with at least four years of driving experience sitting in the front passenger seat.
   - Must maintain a zero blood alcohol level while driving.
   - Cannot drive between midnight and 5 a.m.
   - Limit of one passenger aged 19 or under (exceptions apply for immediate family members).
   - Waiting Period: Drivers must hold a G1 license for a minimum of 12 months, or 8 months if the driver has completed a recognized driver education course.
   - Road Test: After waiting periods and once ready, drivers can take a road test to advance to the G2 stage.

2. G2 License (Class G2)
   - Eligibility: Drivers must have held a G1 license for at least 12 months (or 8 months with driver education), pass a road test, and have a clean driving record.
   - Restrictions:
   - Can drive without a fully licensed driver, but with certain restrictions:
   - Maintain a zero blood alcohol level.
   - Display a green "N" (novice) sign on the back of the vehicle.
   - Limit of one passenger aged 19 or under (exceptions for immediate family members).
   - Cannot drive between midnight and 5 a.m. unless accompanied by a fully licensed driver.
   - Waiting Period: Drivers must hold a G2 license for a minimum of 12 months before taking the final road test for the full G license.

3. Full G License (Class G)
   - Eligibility: Drivers must have held a G2 license for at least 12 months (or 8 months with driver education), pass a final road test, and have a clean driving record.
   - Restrictions: Once the full G license is obtained, there are no further restrictions, and drivers have full driving privileges.
   - Road Test: The final road test assesses driving skills in various road and traffic conditions, and upon passing, drivers receive their full G license.

It's important for drivers to adhere to the rules and restrictions at each stage of the licensing process to ensure safety on the roads and to avoid penalties or license suspensions. Additionally, drivers are encouraged to continue learning and improving their driving skills even after obtaining their full G Driver in Ontario.