What is Modulation?

Modulation is the most common way of varying at least one periodic waveform properties, with a different signal that ordinarily contains data to be communicated. In other words, Modulation is the method involved with converting information into radio waves by adding data to a carrier signal. Modulation is typically applied to electromagnetic signals: radio waves, lasers/optics and computer networks. Modulation schemes are of two types: analog or digital.