What it is:
A tax sale is a sale of property by a taxing authority.
How it works (Example):
For example, let's say that John owns a home and he owes $4,000 in property taxes. A year and a half goes by, and John doesn't pay the taxes. If he is unwilling or unable to pay his taxes after a certain amount of time, the taxing authority will seize his property and sell it in a tax lien foreclosure. The taxing authority uses the proceeds from the sale to pay the taxes owed.