The notice period (Kündigungsfrist) is how long you need to cancel a contract.

For example, if you want to leave your apartment, you must tell your landlord 3 months in advance. There is a Kündigungsfrist of 3 months.

Most phone, internet, electricity and gym contracts have a Kündigungsfrist.

In some cases, you can cancel a contract early if there is a price increase, or if you move to an address where the service is not available1. This is called a Sonderkündigung.