You've been able to ask your users questions that they answer when registering or editing their profile. Now you can give them a set of possible answers that they can choose for those answers. This will make getting their answers even easier and also make sure the data you capture from them is uniform across everyone. To add or edit the possible answers to your questions, just go to "Configure Marketplace" and find the Profile Questions section. You can ask new questions and give them answers, or use the "add" link to add answers to questions you've already posted.
On the profile edit and registration pages, these answers will show up as a drop down box.
Here's a video of it in action: