Hey Renee - A comfort bike is just marketing talk. Here's what one web site says:
Not quite a Mountain Bike, and not quite a Road Bike, the Comfort bikes have one goal in mind - "Comfort." ... These are excellent for riding around the city, campus and town, as well as for commuting purposes. ... These bikes are made to be ridden on roads, bike paths, and can be ridden on some light trails. Comfort Bicycles are designed to give you a more upright riding position, reducing strain on your neck and back.
You should get the bike that makes you want to ride it and that helps you accomplish your goals. That's a combination of looks, function, comfort.
Last year, I got a Townie (a comfort-cruiser). I love the looks, I love the comfort, I get lots of attention riding it. I got it because I wanted to really start riding my bike regularly, and with the Townie, I do. Now, I'm looking to get another bike, a road/utility bike, because my commute home has hills, and the Townie doesn't do well on them. (Though I can't bear the thought of giving up the Townie for errands around the neighborhood!)
(Does this make Townie a gateway bike? :)
You go, Renee! Hope this helps!