It's
xcopy ; the advantage xcopy has over the copy command is that it copies the entire tree including subdirectories and files, it is a more powerful tool that has a number of options to suit your needs, everything from excluding non-empty directories to copying system & hidden files.
To learn about any console command the best option is to open a Command line interface (START > RUN > cmd) and type
that should give you the syntax etc.
Alternately, you can use the windows help and search for xcopy.