RF modulators are electronic devices or circuits used to modulate baseband signals onto radio frequency (RF) carriers for transmission over RF communication channels. They convert analog or digital baseband signals, such as audio, video, or data signals, into RF signals suitable for transmission over RF transmission mediums such as coaxial cables, optical fibers, or wireless channels. RF modulators modulate the amplitude, frequency, or phase of the RF carrier signal according to the input baseband signal, enabling the transmission of information over RF communication links. RF modulators are used in various applications such as cable television, satellite broadcasting, RF communication systems, and multimedia devices for signal transmission and distribution. They play a crucial role in converting baseband signals into RF signals for efficient and reliable communication over RF transmission mediums.