The above information applies to "training" shoes. Racing shoes are all  curved in shape and have little cushion and little or no support.
 
Typically, running shoes provide more cushion and support than other types of shoes. You can walk in running shoes but you should not run in walking shoes.
 
Walking shoes are shaped for "normal" foot shapes, offer "some" support  for overpronation and are designed for forward motion (not lateral).
 
Cross-trainers, basketball, tennis, and aerobic shoes are shaped for "normal" foot shapes; do not offer support for overpronation; and are designed  for and offer support for lateral movement.
 
SHOPPING TIPS AND BENEFITS

Bring your old shoes with you and let the salesperson analyze the wear pattern.
The wear helps identify the type of shoe you need.
 
Bring (or wear) the type of socks that you normally wear (or purchase new  socks for trying on new shoes). The thickness of socks people wear varies  greatly and can affect the shoe size required for a comfortable fit.
 
Dress comfortably and be prepared to test shoes in the store. Try both shoes on (not just one) and walk/run in them. Trying both shoes on can eliminate  an incorrect fitting if your feet are not (most people's are not) exactly the same size. The only way to ensure that shoes fit properly is to actually  walk/run in them.
 
If you wear orthotics, bring them with you. Discuss any other special  needs or injuries that you have with the salesperson.
Some shoes are specifically designed for orthotics and others are not. Testing the shoes with the orthotics will ensure proper fit. Also, knowledge of  any related injuries or foot problems can help a salesperson determine a proper  shoe type for you.
 
Keep an open mind and try what the salesperson recommends. Do not purchase based on an advertisement, a magazine article, the shoes' appearance, or what  you see other people wearing.
Everyone has different needs when it comes to shoes, and your shoe selection should be based on your specific needs and comfort. This will help prevent injuries and increase your walking/running enjoyment.
 
Remember that it is your ultimate responsibility to decide that the shoes  fit well and are comfortable.
If you take the time to ensure your fit and comfort, you will enjoy  exercising more. Only you know how the shoes feel on your feet.

  TYPES OF SHOES AND THEIR
  DIFFERENCES

  Running Shoes
 
- offer shoe shapes for different foot shapes.
- offer the most support for overpronation.
- also best accomodate underpronation.
- are designed for forward motion (not lateral).