What are the different DVI connectors?

The DVI connector on a device can have the following configurations...

DVI-D (digital only, both single-link and dual-link)

DVI-A (analogue only)

DVI-I (digital and analogue, single and dual link)

The are some other types of DVI connectors that you might see such as the M1-DA and DMS59.

The M1-DA is basically a DVI-I Dual Link connector with USB.

The DMS-59 connector is a dual DVI-I Dual Link connector.