Those are tax lien sales. Once a year to once a month (depending on the size of the county) the county has tax lien sales.
Say Suzie Homemaker at 1234 Random Dr is $4,000 behind on her property taxes. At the sale you can actually buy a lien against her house. You pay what she owes in back taxes and then you own a tax lien on her house.
In Indiana (may vary elswhere) Suzie is sent a statement telling her that there is now a lien on the house. If she pays the back taxes within 6 months, you get your $4,000 + 10% interest. If she pays the back taxes within 6-12 months then you get your $4,000 + 15% interest. If after 12 months she hasn't paid the taxes then you get the house.
I attended a tax lien sale a few years ago just to see what is all about and there were two kinds of people there. Bankers that had endless amounts of cash that would only bid IF somebody else bid on a property first. The other people that were there were people trying to make a quick buck. At least that was my experience.
Do yourself a favor Patricia... stop watching late night real estate infomercials!!

There is no quick OR easy way to become a successful real estate investor. It is hard hard work that is not easy and it certainly isn't fast!!! I've been at it for a couple of years now and it's STILL not easy and I wouldn't call myself successful yet. Anyway, my two cents keep the change!