Debugging is the process of examining your application for errors. The process of debugging is accomplished by setting breakpoints and watches in your code and running it in the debugger. This enables you to execute your code one line at a time and examine the state of your application in order to discover any problems.
When you start a debugging session the Debugging window opens in the left pane of the IDE. Additional debugger windows also appear automatically at the bottom of your screen.
You can also debug applications that are running on a remote machine by attaching the debugger to the application process.