"Say your dad sends you an article that you’re too busy to read right now. Or a friend posts a link that looks fascinating, but you’re in the middle of doing something else. Just hit the Pinterest button to save it to one of your boards."
The new button works more like the web:
If you’re on your iPhone, we’ve got a whole new save experience for you. Now things are a lot more visual, it’s easier to create boards, and you can customize each Pin description—just like on the web.
You can download Pinterest from the App Store for free.