Clipless Pedals - Clipless pedals have a special mechanism that attaches you foot to the pedal using a special cleat mounted to the bottom of your shoe. This type of pedal creates a very efficient connection between you and your bike.
Toe Clip Pedals - These pedals allow you to loosely strap your foot to your pedal. I do not recommend toe clip pedals.
Platform Pedals - Platform pedals provide no attachment to your foot but make it very fast and easy to get your foot to the ground.