This is the most basic and best possible or least complicated possible way to connect your phone to a personal computer with a USB data cable. When you connect the data cable between the phone and the computer, a drive letter appears in the operating system which allows browsing, reading, and writing to the storage memory on the phone. It is also useful for copying pictures from the phone to the computer as well as backing up data such as your contacts.
Some new so called Smart Phones require a Vista or newer version Microsoft Windows Media Player to transfer data between the phone and the computer. This is not standard. This is not USB Mass Storage Mode. USB Mass Storage on Android Devices has been discontinued as of Android version 4.1.1.
In USB Mass Storage Mode, your phone will appear to the computer just like any other flash memory type, such as a thumb-drive or SD card.
A simple and small in file size driver might be necessary to make this work. Bloatware such as Samsung Kies should _NEVER_ have to be installed for a basic USB mass storage mode connection. Typically, if you skip driver installation, Microsoft Windows XP or later will still allow USB Mass Storage mode as long as the phone supports it and USB Debugging is enabled.