When you possess a unit, you have a tenancy. Having a tenancy means you have the right to live in the unit, and to keep others from the unit. The landlord’s ownership rights mean that the landlord can end the tenancy, and once the tenancy is ended, can take back possession of the unit.
A “termination notice” tells you that the landlord wants you to leave the unit and the date when the landlord wants you out. The termination notice must be in writing and is the only way to legally end a tenancy.
The notice can be a letter with no title or it can be a document with a title on top. It may say: Notice to Terminate Tenancy, Termination Notice, Termination of Rental Agreement, Termination of Lease, Eviction Notice, Notice to Vacate, Expiration Notice or Notice to Quit. It doesn’t need a signature, but it must come from the landlord or the landlord’s lawyer.
Regardless of the style, here we will call it a “termination notice.”