Machine.Config and web.config

Machine.Config

The config files are used to give the instructions to the web pages,all config files are implemented using XML .using XML files we can give the instructions at the design time as well as at the run time. The machine.config file is web server level any wrong modification having in the machine.config file we Can not execute  any asp.net application

web.config:

Using web.config file we can give programmer defined instructions to the web pages.The web.config file is application level in the web application .We can work with multiple web.config files,when any wrong modifications having in the web.config file we can not execute current application only