What is a PCB connector, PCB usb connectors, HDMI PCB connector, flex connector

 A wide range of PCB connectors: flex (flexible) PCB connector, power, HDMI PCB connectors, high current PCB connectors, PCB USB connectors and other types of PCB-to-PCB connectors.

https://www.futureelectronics.com/c/interconnect/connectors-pcb