In popular terms, high side drive (HSD) means that the drive device is enabled by closing the switch in the power cord directly before using the appliance or drive device, and low side drive (LSD) is enabled by closing the ground wire after using the appliance or drive device.
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High side drive: In the image point, it is like adding a controllable switch to the power side of the circuit. The high side drive is what controls this switch switch. Low side drive: The image point is said, like adding a controllable switch at the ground end of the circuit. The low side drive is what controls this switch switch.
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High side drive features: suitable for precision device instruments, high side switch (generally MOSFET switch) drive a little more complex, low wiring cost, generally using high side drive then you have to increase the bootstrap circuit.
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Low side drive characteristics: low side drive is relatively easy to achieve (the circuit is also relatively simple, generally by the MOS tube plus several resistors, capacitors), applicable circuit simplification and cost control.