What does 'FSK' stand for and how is it used?

'FSK' stands for Frequency Shift Keying, which is a modulation technique used to transmit digital data over communication systems by varying the frequency of the carrier wave. In FSK, digital information is represented by changes in the frequency of the signal, allowing one frequency to represent a binary '1' and another frequency to represent a binary '0'. This frequency change enables the effective communication of data in environments where analog signals might be prone to interference.

Utilizing FSK provides several advantages, including its resilience to noise and ability to maintain a stable data transmission rate. This makes it particularly useful in applications such as telecommunications, data modems, and wireless networks, where reliable transmission of digital data is essential.

The other options describe terms or functions that do not align with the defined standard or common use of FSK in data communication.