The adjective appealing describes someone who is able to attract interest or is easy to like. For example, your easy sense of humor and way of making people feel comfortable make you appealing to friends old and new.
If you are appealing, people want to be around you. It might be that you are really nice, or a good listener, not to mention have good looks. Actors who are appealing tend to get a lot of parts because filmmakers know audiences will flock to see them, just as an appealing description of a dish on a menu will lead more people to order it. This something is appealing, it is — or will be — popular.