The back of a TV or graphics card can look like a wall of mystery sockets. Almost all of the confusion clears up once you separate three things: the connector shape, its version, and whether the signal is digital or analog.
The modern digital connectors
- HDMI — the universal AV connector for TVs, consoles, and players. Comes in Standard (Type-A), Mini (Type-C, on cameras), and Micro (Type-D, on action cams). Carries video, audio, and control on one cable.
- DisplayPort — the PC-monitor standard, rectangular with one notched corner. Higher bandwidth and features like daisy-chaining; also a Mini DisplayPort version.
- USB-C (DisplayPort Alt Mode) — video over the reversible USB-C connector, if the port supports it.
Same shape, different limits
The biggest trap with HDMI and DisplayPort is that the connector never changes between versions, but the capability does — dramatically:
| Version | Bandwidth | Typical max |
|---|---|---|
| HDMI 1.4 | 10.2 Gbps | 4K30 · 1080p120 |
| HDMI 2.0 | 18 Gbps | 4K60 · 1440p144 |
| HDMI 2.1 | 48 Gbps | 4K120 · 8K60 |
| DisplayPort 1.2 | 21.6 Gbps | 4K60 · 1440p165 |
| DisplayPort 1.4 | 32.4 Gbps | 4K120 · 8K60 (DSC) |
| DisplayPort 2.1 | 80 Gbps | 4K240 · 8K120 |
The legacy analog set
Older equipment uses analog connectors, where the picture is a varying voltage rather than digital data:
- VGA (HD-15) — the blue 15-pin plug for old PCs and projectors. Analog, video only.
- DVI — the transitional connector. DVI-D is digital, DVI-A is analog, DVI-I carries both; single-link vs dual-link sets the resolution ceiling.
- Composite (yellow RCA), S-Video, and Component (red/green/blue RCA) — standard- to high-definition analog from consoles, VCRs, and DVD players.
- SCART — the chunky 21-pin European all-in-one that carries RGB or composite video plus audio.
- BNC — the locking bayonet connector used in broadcast and pro video (SDI, RGBHV).
Adapters: passive vs active
Whether an adapter works comes down to the signal. A passive adapter just rewires pins, so it only works when the source can already output the destination's signal — for example DVI-D to HDMI (both digital), or a DisplayPort++ output to HDMI/DVI. Converting between analog and digital — VGA to HDMI, or HDMI to VGA — always needs an active adapter with a real conversion chip and often its own power. When you are unsure, an active adapter is the safe choice.
Quick guidance
For a new setup, prefer HDMI for TVs and home theater, and DisplayPort for high-refresh PC gaming; both carry audio and scale to 4K and beyond. Reach for USB-C video when your laptop supports it and you want one cable for display and power. Keep VGA, DVI, and the analog connectors in mind only for connecting to older displays and retro gear — and budget for an active adapter whenever you cross the analog/digital line.
Frequently asked questions
Does the connector shape tell me the resolution?
Only partly. The shape tells you the family; the version sets the real limit. An HDMI 1.4 port and an HDMI 2.1 port are physically identical but one tops out near 4K30 and the other does 4K120 or 8K. Always check the version, not just the shape.
HDMI or DisplayPort — which should I use?
For a TV or console, HDMI. For a high-refresh PC monitor, DisplayPort usually offers more bandwidth and features like daisy-chaining and Adaptive-Sync. Many devices have both; use HDMI for TVs and DisplayPort for gaming monitors.
When do I need an active adapter?
Any time you convert between analog and digital — VGA to/from HDMI/DisplayPort/DVI-D always needs an active adapter. Active adapters are also needed for most USB-C/DisplayPort to HDMI 2.0+ at high resolution. Passive adapters only work when the source can already output the other signal directly.
What is the difference between single-link and dual-link DVI?
Dual-link DVI uses the full center block of pins to roughly double bandwidth, reaching 2560×1600. Single-link tops out around 1920×1200 at 60 Hz. DVI-I adds analog pins (for VGA via adapter); DVI-A is analog only.
Does VGA or DVI carry sound?
No. VGA and DVI are video only — you need a separate audio cable. HDMI, DisplayPort, USB-C video, and SCART carry audio with the picture.
Why won’t my USB-C port drive a monitor?
Video over USB-C needs DisplayPort Alt Mode or Thunderbolt, and not every USB-C port supports it. Look for a DisplayPort or Thunderbolt logo, or check the device spec.