Hello everyone , I'm new to photography and I'm confused with somethings. May I know , what are PC cords for? My understanding is that for people to trigger their lights , they connect a PC cord from their camera onto the flash / slave transmitter on their hot shoe. If this is correct then why do they have to connect the cord? Won't the light trigger even without a cord as long as it is in the hot shoe? Thanks , hope you can help me.