What does ISDN stand for?

ISDN stands for Integrated Services Digital Network. This term refers to a digital communication standard that enables the transmission of voice, data, and video over traditional circuits. Developed to meet the increasing need for high-quality communications and to support multiple types of services, ISDN integrates various transmission methods to facilitate a seamless exchange of information.

The significance of ISDN lies in its ability to provide end-to-end digital connection for telephone networks, offering features such as point-to-point connectivity and the capability to carry multiple calls and data streams over a single line. This makes it a highly versatile and efficient system for both personal and commercial communication purposes.

In contrast, the other options provide alternative acronyms that do not align with established telecommunications terminology or standards. They might sound plausible, but they do not accurately represent the widely recognized ISDN standard used in digital telecommunications.