Peripherals, Video Connectors, and USB

VGA is ANALOG. HDMI, DisplayPort, and DVI-D are DIGITAL. DVI-A is analog; DVI-I carries both.

• Analog-monitor connectors: VGA (D-sub 15-pin) and DVI-A. A multi-answer question asking for analog monitor connectors wants both.
• HDMI carries digital video plus audio; mini-HDMI is a smaller variant; both are fine for projectors.
• DisplayPort also carries digital audio and video, using a 20-pin connector.
• DVI variants: DVI-A analog only, DVI-D digital only, DVI-I integrated (both). To connect DVI-A to DVI-D you need a cable terminated A on one end and D on the other.
• Thunderbolt combines DisplayPort video with PCIe data on one cable. Thunderbolt 2 uses the oval mini-DisplayPort shape; Thunderbolt 3 and 4 use USB-C.
• Lower monitor resolution frees bandwidth, so the maximum supported refresh rate tends to increase.

USB 2.0 (High Speed) = 480 Mbps. Do not confuse it with 12 Mbps (USB 1.1 Full Speed) or 5 Gbps (USB 3.0).

• Port color signals FUNCTION, not version: yellow = always-on charging port (works with the PC powered off), blue = USB 3.x, black/red = standard.
• Thunderbolt 3 and USB4 both use the USB-C connector — a favorite two-answer exam question.
• Mini-USB is the classic camera connector; Micro-USB and Lightning (Apple) carry both power and data.

• Molex = legacy 4-pin power for PATA drives and optical drives. Power only, no data.
• SATA power goes to modern drives; eSATA extends SATA data externally at up to 6 Gbps but supplies NO power.
• eSATA is slower than USB4 and Thunderbolt 3 (both 40 Gbps), and its connector is larger than USB-C.
• DB-9 is a legacy serial connector — used for serial ports, not drives.
• Molex is also NOT a peripheral input-device connector; input devices use USB, D-sub, or 1/8-inch audio jacks.
• Speed ranking: Serial (kbps, slowest) << USB 2.0 < eSATA (6 Gbps) < USB 3.x < USB4 = Thunderbolt 3/4 (40 Gbps).