A VGA box is a video converter that allows the display of common analog video standards on a VGA computer monitor. Video signals converted on this kind of unit range from S-Video to component video signals. Some VGA boxes have audio outputs on them so that they can also act as plug adapters for RCA audio inputs to use computer speakers. Some models of VGA boxes allow a computer with a multi pin high-resolution port to use them on other occasions. Others models include devices that convert VGA signals to composite, S-video or component video, as well as SCART in Europe.
People have used video this type of device so they can use their game consoles, VCR and DVD players on their computer monitor. Though in the modern world, media on those formats is feasible to convert to a format playable directly off the computer, sometimes through the opposite function of displaying computer output on a standard NTSC TV with composite/s-video.
Also there is an object called vga to rca converter which converts normal vga to vga to rca which allows you to view multiple screens on different devices