Everything You Need to Know
About HDMI

What is HDMI?

HDMI stands for High-Definition Multimedia Interface. It's the standard cable and connector used to transmit high-quality video and audio between devices — from your Blu-ray player to your TV, your laptop to a monitor, or your gaming console to a display.

Unlike older connections (like composite RCA or VGA), HDMI carries both video and audio through a single cable. It was introduced in 2002 and has since become the universal standard for home theater, computing, and gaming equipment worldwide.

What devices use HDMI?

Pretty much everything modern: TVs, monitors, projectors, laptops, desktop PCs, gaming consoles (PS5, Xbox Series X, Nintendo Switch), streaming devices (Roku, Fire Stick, Apple TV), Blu-ray players, cable boxes, soundbars, and AV receivers.

HDMI Versions Explained

HDMI has gone through several major versions since 2002, each adding support for higher resolutions, faster refresh rates, and new features. Here's what each version means in plain English.

HDMI 2.1 — What's the big deal?

HDMI 2.1 is a massive leap forward. Its 48Gbps bandwidth is nearly 3x that of HDMI 2.0, enabling 4K gaming at 120fps (frames per second) — critical for competitive gaming and the full potential of PS5 and Xbox Series X. It also introduced Variable Refresh Rate (VRR) which eliminates screen tearing, and Auto Low Latency Mode (ALLM) which automatically puts your TV in game mode when a console is detected.

HDMI Switch vs Splitter — What's the Difference?

This is the single most common point of confusion in the HDMI world. They look similar and even sound similar, but they do completely opposite things.

Can a splitter show different content on each screen?

No. An HDMI splitter mirrors the exact same signal to all connected displays. All screens will show identical content simultaneously. If you want different content on different screens, you need either a switch or a matrix switch (which can route multiple inputs to multiple outputs independently).

HDMI Cables — What You Actually Need to Know

Walk into any electronics store and you'll see HDMI cables priced anywhere from $5 to $100. Is there a real difference? Mostly no — but there are a few things worth knowing.

Are expensive HDMI cables worth it?

For most people, no. HDMI is a digital signal — it either works perfectly or it doesn't. A $10 cable from a reputable brand will perform identically to a $60 "premium" cable for 4K HDR content. The only time cable quality genuinely matters is for very long runs (over 15 feet) or HDMI 2.1 bandwidth at high resolutions.

HDMI Cable Types

ARC and eARC Explained

ARC (Audio Return Channel) and eARC (Enhanced Audio Return Channel) are features built into specific HDMI ports that allow audio to travel in both directions over a single cable — eliminating the need for a separate optical audio cable between your TV and soundbar.

ARC vs eARC — What's the difference?

ARC (introduced in HDMI 1.4) supports compressed audio formats like Dolby Digital and DTS. It's enough for basic surround sound from a soundbar. eARC (introduced in HDMI 2.1) supports uncompressed and high-bitrate formats like Dolby TrueHD and DTS:X — the same quality formats found on Blu-ray discs.

Does my HDMI switch support ARC?

Most basic HDMI switches do not pass through ARC signals — this is an important limitation to know. If you need ARC to work with a soundbar through a switch, look specifically for switches that advertise ARC or eARC passthrough support. They cost a bit more but are worth it for home theater setups.

HDMI for 4K and 8K

4K resolution (3840×2160 pixels) is now the mainstream standard for TVs and monitors. 8K (7680×4320) is emerging but still rare. Here's what HDMI version you need for each scenario.

Frequently Asked Questions