High-speed placement machine: A device that accurately places tiny surface-mount (SMD) components on a PCB pad by moving the mounting head. It is mainly composed of rack, PCB transmission and bearing organization, drive system, positioning and alignment system, mounting head, feeder, optical identification system, sensor and computer control system.

That's to say, go through the procedures of "capture-displacement-positioning-mounting",  the SMD components are able to quickly and accurately placed.

BTW, in the whole PCBA production line, high-speed placement machine is placed after the dispenser or screen printer.