A USB Hub 4 Port is a device that expands the number of available USB ports on a computer or other device, allowing you to connect multiple USB devices simultaneously. Typically, a 4-port USB hub will have one USB input (usually connected to your computer) and four USB outputs for connecting devices like printers, external hard drives, flash drives, mice, or keyboards.

Here are some key features you might find in a 4-Port USB Hub:

1. Plug-and-Play: Most hubs don't require drivers and are automatically recognized by the system when plugged in.
2. Power Options:
   • Powered USB Hub: Some hubs include an external power adapter to provide additional power, making them suitable for devices like hard drives that require more power.
   • Bus-powered USB Hub: These hubs draw power directly from the connected device (e.g., a laptop), so no external power source is required.
3. Data Transfer Speed: Depending on the USB version (USB 2.0, 3.0, or 3.1), the data transfer speeds can vary:
   • USB 2.0: Up to 480 Mbps.
   • USB 3.0/3.1: Up to 5 Gbps (USB 3.0) or 10 Gbps (USB 3.1).
4. Compact Design: Most 4-port USB hubs are small and portable, which makes them easy to carry around.

USB hubs are commonly used for expanding limited USB ports on laptops or desktops, and they are available in various designs and models depending on the features you need (e.g., extra charging ports, high-speed data transfer, etc.).