You need a USB 3.0 hub if your computer has at least one USB 3.0 port and you either want more ports or want those ports in a more accessible place.
Moreover, many laptops have only one or two USB 3.0 ports, often alongside USB 2.0 ports. Also, many desktop computers have USB ports in difficult-to-reach locations.
FYI: USB 3.0 ports and devices may emit radio-frequency noise that can interfere with devices using the 2.4GHz wireless band (e.g. wireless mice and keyboards that use RF dongle). The noise can be emitted anywhere along the USB 3.0 connection.
Good USB 3.0 hubs are compact, reliable, and have many well-placed ports.
The best USB 3.0 hub: Anker 10-Port USB 3.0 Hub (10 ports, seven USB 3.0 data ports and three high-speed charging ports, all facing upward to take up less room on your desk)
The second best USB 3.0 hub: Anker 7-Port USB 3.0 Hub (less expensive than top pick)
The best USB 3.0 hub with more data ports: Anker AH231 (nine USB 3.0 data ports, one 2.1-amp charging port, a bit pricey)
The best small USB 3.0 hub: Sabrent HB-W4U3 (flat design)