What does FSK stand for in digital communication?

In digital communication, FSK stands for Frequency Shift Keying. This modulation technique encodes digital information in the frequency of a carrier wave. Specifically, it represents binary values by switching between different frequencies. For instance, one frequency might represent a binary '1' and another frequency might represent a binary '0'. This method is effective in minimizing interference and providing reliable transmission over various distances and conditions.

The other options provided do not accurately define FSK. "Frequency Signal Keying" and "Fast Shift Keying" are terms that do not exist in common telecommunications terminology related to modulation techniques. "Field Shift Keying" also does not pertain to recognized modulation methods. FSK remains a crucial concept in the field of digital communications, and understanding its fundamentals is essential for anyone working with data transmission technologies.