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The defining experience when using a smartphone is the diverse set of apps, the little programs, you load on it to make the phone do things. Increasingly, there's a choice of operating system, too. Sure there's Apple iOS, Google Android, Windows Mobile -- but at a big conference on mobile technology in Barcelona, Spain, a Samsung phone using a strange operating system was announced.

Samsung's new OS is called Tizen, and there are other rivals coming soon, including one from the browser maker, Firefox.

Sarah Rotman Epps, senior analyst at Forrester Research, joins Marketplace Tech host David Brancaccio to discuss where Tizen will be used and why Samsung is launching the new alternative system.

Follow David Brancaccio at @DavidBrancaccio