Real causal tracing
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USB hubs are small, portable devices you can plug directly into a port on your laptop to get extra USB ports, SD card readers, headphone jacks, and other connections that your computer may not have. The inclusion of USB-C with Power Delivery even means that you use them at your with your laptop charging. However, if you plan on regularly connecting your laptop to a full-blown workstation—with a keyboard, mouse, multiple monitors, the whole shebang—then you might want to consider a docking station instead.