The USB HUB HAT (B) is a 4x ports USB HUB designed for Raspberry Pi. It's pogo pin design is specialized for Zero series, while the onboard normal USB connector can be used to connect with other Raspberry Pi boards or PC through a USB cable.

•     4x extended USB ports, compatible with USB 2.0 / 1.1
•     Pogo pin design, for direct connecting with Raspberry Pi Zero/Zero 2W/Zero W/Zero WH
•     USB HUB connector, for connecting with Raspberry Pi 4B/3B+/3A+/2B through USB cable

specialized pogo pin for Zero series, plug-and-play, without preventing other HATs
normal USB HUB connector for other Raspberry Pi boards or PC