Open the command prompt and simply type cd. You will see you current working directory displayed.
The CD command takes a path argument when you want to change the working directory. For example, to change the current working directory to the windows temporary directory, you can type something like
cd %temp% or
cd D:\Users\Staphy\AppData\Local\Temp (depends on your operating system)
You may want to change the current directory if there are files in the new directory that you want to use.
There is another command quite like the CD command. This command, CHDIR, performs the same function as the cd command with only a subtle (in my opinion) difference.