A method of keying so the dots and dashes are produced by electronic methods.

Keying is the forming of signals; such as, for telegraph transmission, by modulating a direct-current or other carrier between discrete values of some characteristic.

Keying is also defined as the shaping of a signal to convey information, known as modulation or the process of conveying a message signal, for example a digital bit stream or an analog audio signal, inside another signal which can be physically transmitted with an alternating-current source; for example, by interrupting it or by suddenly changing its amplitude, frequency, or some other characteristic.