What monitor is this? Cables needed?

It's Dell P1913S monitor.  For display cable connection, it can be a DisplayPort, a DVI, or a VGA cable.  Depending on graphics ports of your computer, an adapter cable may be needed.

For more information, here is the monitor user's guide  https://dl.dell.com/manuals/all-products/esuprt_display_projector/esuprt_display/dell-p1913_user's%20guide_en-us.pdf