HDMI cables, or high-definition multimedia interface cables, are used to transmit digital audio and video from a source to a display system. Common uses include connecting video from a laptop or cable box to a computer monitor or TV.
A DisplayPort cable is used to connect a video source to a display device like a television or computer monitor, similar to an HDMI cable.
A VGA cable, or a video graphics array cable, is used to connect a computer to a display device by transmitting analog video signals from the CPU to the monitor. VGA is a relatively old cable type and is rarely used today.
A power cable is an electrical cable that is used to transmit electrical power. They utilize a combination of electrical conductors concealed by a sheath.
Ethernet cables are used to physically connect your computer or device to the internet by connecting it to a modem or wifi router.