What is a USB Hub?
A USB hub is a device that splits a single USB port on your computer into multiple ports, letting you connect several peripherals at the same time. Modern laptops often ship with only one or two USB-C ports, which is not enough for a mouse, keyboard, USB flash drive, and external storage. A USB hub fills the gap, and many multifunction hubs go further by adding HDMI output, SD card slots, Ethernet, and power-delivery passthrough – making them the centerpiece of a tidy desk setup.
In-Depth
Bus-Powered vs. Self-Powered Hubs
| Type | Power Source | Best For |
|---|---|---|
| Bus-Powered | Draws power from the host PC | Low-power peripherals (mouse, keyboard, flash drive) |
| Self-Powered | External AC adapter | Power-hungry devices (external HDDs, charging) |
Bus-powered hubs are compact and cable-free (aside from the host cable), making them ideal for travel. Self-powered hubs provide stable voltage to every port, which is important when connecting devices that draw significant current, such as external hard drives or devices that need USB charging.
Multifunction Hubs (Multiport Adapters)
The most popular USB hubs today go well beyond simple port replication. A typical multifunction hub plugs into a single USB-C port and expands it into USB-A ports, an HDMI output, an SD and microSD card reader, a Gigabit Ethernet jack, and a USB-C PD passthrough port for laptop charging. This turns a single-port ultrabook into a full workstation with one cable. For users who need even more connectivity – dual monitors, audio, multiple USB 3.0 ports – a full docking station is the next step up.
USB Standards and Transfer Speeds
USB 2.0 hubs max out at 480 Mbps, which is adequate for keyboards and mice but painfully slow for file transfers. USB 3.0 (USB 3.2 Gen 1) hubs support 5 Gbps, and USB 3.2 Gen 2 hubs push 10 Gbps. Note that all ports on a hub share the bandwidth of the single upstream connection, so simultaneous transfers across multiple ports will divide that total throughput.
How to Choose
1. Count Your Ports and Identify Needed Types
List every device you plan to connect and note whether each needs USB-A, USB-C, HDMI, Ethernet, or a card slot. Three to four USB-A ports cover most general setups; add HDMI if you use an external monitor and Ethernet if you need wired network access.
2. Insist on USB 3.0 or Higher
If you transfer files to external storage or USB flash drives, USB 3.0 (5 Gbps) is the minimum. USB 2.0 hubs are fine for input peripherals only, but the small price difference makes USB 3.0 the obvious default choice.
3. Check for PD Charging Passthrough
A USB-C hub with Power Delivery passthrough lets you charge your laptop through the hub while using all the other ports. This is essential for single-port laptops and eliminates the need to unplug the hub every time you want to charge. Confirm the passthrough wattage is sufficient for your laptop.
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The Bottom Line
A USB hub is the simplest solution to the port shortage that plagues modern ultrabooks and tablets. Decide how many ports and which types you need, choose USB 3.0 or higher for data-capable ports, and opt for PD passthrough if you want to charge your laptop through the hub. A well-chosen hub keeps your desk clean, your peripherals connected, and your workflow uninterrupted.