Photo courtesy Amazon.com The DeLorean played a prominent role in the "Back to the Future" movies.

This may seem a bit confusing, but really, it's quite simple. The majority of us are getting tired of ads. Today's consumer is inundated with advertising eveywhere: television, radio, billboards, magazines, buses, newspapers, the Internet... And these are just the usual suspects. More and more ad-space is popping up every day. From people walking down the street wearing signs, to flyers on our cars and in our mailboxes, to ads on the ATM screen as we wait for it to dispense our cash -- we see ads all day, every day.

Even television networks that depend on advertising dollars to stay in business know that it can be useful to ditch the interruptions and present a show without ads from time to time. The ABC network did it for "Gideon's Crossing" in 2000 and for "Alias" in 2001. FOX did it for its hit series "24" in 2002.

Photo courtesy Isabella Vosmikova/FOX Apple laptop computer on "24"

Wait a minute -- networks turning down cold, hard advertising cash? That doesn't sound quite right, does it? Of course they don't drop the advertising dollars all together. If you watched that "ad-free" version of "24" you know what we're talking about. Ford sponsored the show with two three-minute spots opening and closing the episode. And, Ford vehicles have been integrated into the show -- the main character, Jack Bauer, drives a Ford Expedition.

So, when is an ad not an ad? When it's a product placement. Once mainly found only on the big screen, product placement has been making quite a few appearances on television -- not to mention in video games and even books. In this article, we'll explain what product placement is and examine how it is used in movies, television shows and other media.