This document discusses different types of clipping circuits. There are two main types of clippers: series clippers and shunt clippers. Series clippers have the diode and resistor connected in series with the input signal, while shunt clippers have them connected in parallel. Both can clip either the positive or negative half of the input waveform. Clippers prevent signals from exceeding a reference voltage level and are used to shape waveforms, in power supplies, and to remove ripples in FM transmitters. They provide overvoltage protection but can also clip transmitted data values outside the circuit's range.