Cycling shoes are purpose designed footwear. Different styles and types are available for the various disciplines of cycling. There are two main types of cycling shoes: road or mountain bike. Road cycling shoes are designed to be only used for cycling due to the construction of the sole. Mountain bike cycling shoes are more acceptable for walking in (for short distances) as the sole is rugged and designed with this in mind.
Cycling shoes allow you to transfer power more efficiently especially when combined with clipless pedals or the less common toe-clip pedals. The shoes allow the fitting of pedal specific cleats, these fix into the pedals. The difference you will notice in terms of performance and comfort when using cycling shoes really is remarkable. You will never want to go back to standard shoes - the difference is so noticeable.
When choosing your cycle shoes it's important to select based on the amount and level of cycling you intend to do. As the price increases, in most cases so does the technology and features on the shoes. This could be anything from the fitting system to the rigidity of the sole. A mountain bike shoe is more suited and would certainly last longer than a lightweight road specific shoe in this situation.