While Thunderbolt 3 shares the same connection type as USB-C, not all USB-C ports are Thunderbolt 3 enabled.

Look for the Thunderbolt insignia next to the port if you aren't sure.  

Note that some MACs do not have the insignia printed on them, and the LEFT-side ports are usually Thunderbolt 3 on Macbook PRO series.  

As of today, most Windows laptops with Thunderbolt 3 ports, only have 1 port on the left-side or the back-center of the laptop.  

Thunderbolt 3 (USB-C)

Use Thunderbolt 3 (USB-C)  with displays and other devices that connect using a Thunderbolt 3 (USB-C) cable or USB-C cable. You can also connect a USB-C power adapter and cable to charge your notebook computer. If you have a device that doesn't connect to this port, you might be able to use an adapter to connect it.

USB-C

Use USB-C with displays and other devices that connect using a USB-C cable. You can also connect a USB-C power adapter and cable to charge your notebook computer. If you have a device that doesn't connect to this port, you might be able to use an adapter to connect it.

USB-C has the same shape as Thunderbolt 3 (USB-C), but doesn't support Thunderbolt devices. If your Mac has only one port like this, it's a MacBook with USB-C.
  

USB-A

Use USB-A with devices that connect using a USB-A cable. USB-A ports are sometimes known by the USB specification of the port: USB 3, USB 2, or USB 1. The USB specification relates to the speed at which the port can transfer data, and the amount of power it can supply to a connected device.

Thunderbolt 2, Thunderbolt

Use Thunderbolt 2  or Thunderbolt  with displays and other devices that connect using a Thunderbolt cable. 

Thunderbolt 2 and Thunderbolt are not the same as Mini DisplayPort . They have the same shape, but use different symbols on the cable and port.