Difference between forward slash(/) and backward slash(\)

Many of us has a confusion where to use forward slash and where to use backward slash.The backward slash is used to navigate to the resources out of our system for e.g consider the url http:\\www.google.com\adsense it is used to reach resource outside of your system.The forward slash is used reach the resource within your machine for e.g c:\windows\system32.I hope you understand the difference