Lien explained
A lien is a charge attached to a property's title that protects a creditor's interest. If the owner fails to pay the underlying debt, the lien gives the creditor a legal pathway to recover what they are owed, potentially by forcing a sale of the property. Liens are recorded in the provincial land registry so they are visible to anyone searching the title.
Liens rank in priority, usually by registration date, which determines who gets paid first if the property is sold. A first mortgage is typically the senior lien; later charges, such as a second mortgage, a builder's or construction lien, or a tax lien, sit behind it. Because liens cloud title, they generally must be cleared before a property can be sold or refinanced.