There are several versions of Digital Visual Interface (DVI) connectors, including DVI-A, DVI-D, and DVI-I, and they can be single or dual link: 

DVI-A: This connector only carries analog signals, such as VGA. It's rarely used. 
DVI-D: This connector only carries digital signals, such as HDMI. It can be single or dual link. 
DVI-I: This connector carries both analog and digital signals. It can be

single or dual link. 
Single link: This connector has a maximum resolution of 1920 x 1080 at 60 Hz. 
Dual link: This connector has a maximum resolution of 2560 x 1600 at 60 Hz. 

The number of pins on the DVI connector identifies the type of connector. For example, a DVI-A connector has 17 pins, a DVI-D Single Link connector has 19 pins, and a DVI-I Dual Link connector has 29 pins. 
DVI is a strong choice for delivering high-quality video images, but it doesn't carry sound. A separate cable is needed for sound when using DVI. HDMI is a newer connection that can handle both sound and video.