Im interested in two trek bikes but what's the difference?

 

logo Whats the difference between a comfort bike and a hybrid?
2012 VELO Mountain Bike Comfort Foam Handlebar bar Grips MTB Bicycle RED New
2012 VELO Mountain Bike Comfort Foam Handlebar bar Grips MTB Bicycle RED New
Paypal   US $.99 		2012 VELO Mountain Bike Comfort Foam Handlebar bar Grips MTB Bicycle Yellow New
2012 VELO Mountain Bike Comfort Foam Handlebar bar Grips MTB Bicycle Yellow New
Paypal   US $.99 		2012 VELO Mountain Bike Comfort Foam Handlebar bar Grips MTB Bicycle Blue New
2012 VELO Mountain Bike Comfort Foam Handlebar bar Grips MTB Bicycle Blue New
Paypal   US $.99