Can I connect two monitors with HDMI?

Sometimes you have only one HDMI port on your computer (typically on a laptop), but need two ports so that you can connect 2 external monitors. You can use a switch splitter or display splitter to have two HDMI ports.

Can you use a USB to connect a monitor?

The USB to HDMI active adapter basically works like an external graphics or video card as an interface between the computer and monitor. Most computers will have a USB 2.0 or 3.0 Type A port. This is the slender rectangular port. When you purchase the USB to HDMI adapter you may have a choice of a 2.0 or 3.0 adapter.