JDate allows you to browse profiles of other users where you can see details about them including the percentage of how high you match with each other. You can also see how far the user is from your location.
The Matches section will show recommended profiles that match your preferences. To recall, you filled out some personal details during the signup process which JDate uses to find profiles compatible with you.
The Lookbook allows you to view one profile at a time. This is similar to Tinder wherein you can "Like" or "Pass" on certain users. When you both "Like" each other, you find a match.
If you avail of the premium feature, you can see who viewed your profile, and who liked you and you will also get notifications if you have new messages.