Once your policy has run for 12 months without making a claim, you will gain one year’s no claims bonus which you can use to help you get a reduction in premium the following year, and your no claims bonus will increase by one year each time that you do this.
It might not necessarily always mean that your insurance will be cheaper than the previous year each time, but it does usually mean you receive a discount on the original premium, making it something that can be very helpful to young drivers.