What is the meaning of Modulation?

The variation and regulation of a population, physiological response, etc.

  1. The process of applying a signal to a carrier.
  2. A change in key.
  3. Contrast between the thin and thick parts of the strokes of a typeface.

The process of applying a signal to a carrier.

A change in key.

Contrast between the thin and thick parts of the strokes of a typeface.

modulation

inflection (change in pitch or tone of voice)

modulation

modulation (change in key)

Source: wiktionary.org