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Frequency Modulation changes the frequency of the carrier wave to represent the amplitude of the analog message signal. It is commonly used for FM radio broadcasting due to its resistance to signal amplitude noise.

QPSK transmits two bits per symbol by changing the phase of the carrier to one of four possible values. It is used in satellite communication as it provides a balance between bandwidth efficiency and robustness to noise.

PWM controls the width of the pulses to transmit information or control power supplied to electrical devices. It's often used in digital control circuits for motors and LEDs.

PAM involves modulating the amplitude of pulses in a pulse train with the message signal. It's used as a simple form of modulation in time-division multiplexing systems.

QAM combines two different signals modulated by different sine and cosine functions to allow the transmission of two bits per symbol. It's widely used in cable modem and satellite communications.

Phase Modulation alters the phase of the carrier wave to match the amplitude of the message signal. It is similar to FM and is often used in digital cellular technology.

PSK encodes data by changing the phase of the carrier wave. It is used extensively in wireless LANs, RFID and Bluetooth communication.

PCM converts an analog signal into a digital signal by sampling the signal's amplitude and encoding it into a binary form. It is the standard form for digital audio in computers and various compact disc formats.

FSK represents digital information through discrete frequency changes of the carrier signal. It is often used in modems, RFID and some wireless communication systems.

PPM varies the position of each pulse in a regular stream of pulses according to the amplitude of the message signal. It is less vulnerable to noise but more complex than other pulse modulation techniques.

Amplitude Modulation involves varying the amplitude of a carrier wave in accordance with the amplitude of the message signal. It is often used in broadcasting radio signals in AM radio.

ASK transmits data by varying the amplitude of the carrier wave. This modulation technique is simple and used in some forms of wireless data communication.

OFDM works by splitting a high-data-rate stream into multiple lower data rate streams that are transmitted simultaneously over a number of sub-carriers. It is widely used in modern broadband wireless systems.

DPSK encodes data based on changes in the phase between successive signal elements rather than referencing a fixed base phase. It improves performance under varying signal conditions.