Mapping (sometimes called "mounting") a drive means you assign a drive letter on your computer to the server path. You can then connect to the server without having to remember and type the path every time.
Step 1. Click on the Start Menu
Step 2. Click My Computer
Step 3. Choose Map Network Drive
Step 4. Select the Drive Letter
Step 5. Enter the path to the Server
Step 6. Add Checkmark to Connect using different credentials
Step 7. Click Finish