XBOX is a gaming console. You buy a game disk to play games. Nothing more then a TV or monitor is needed to do that. Although you might need an adaptor for a direct connection to a monitor.
However Xbox can do more.
With a connection to a computer you can get an Xbox Live account which you can play games with other people online as long as you have the game disk.
You can connect to your computer to access video and picture files which you can then view on your TV.
With the proper Live account you can message, Stream through Netflix and video conference with other Live users.
So although it is primarily a gaming console it is capable of doing more.