Which of the following describes the main characteristic of a wireless connection in networks?

The main characteristic of a wireless connection in networks is that it relies on radio waves for communication. This technology allows devices to connect and communicate without the need for physical cables, which is a defining feature of wireless networks. Radio waves enable data to be transmitted over distances, facilitating connectivity between devices such as computers, smartphones, and network routers without the constraints of wires.

The other options do not align with the fundamental nature of wireless connectivity. For instance, the use of physical cables directly contradicts the concept of wireless technology. Utilizing light to transmit data describes optical communications, such as fiber optics, rather than wireless communication. While satellite signals can be a form of wireless communication, they do not broadly define all wireless connections, which primarily utilize radio waves. Thus, focusing on radio waves captures the essence of what constitutes a wireless connection in networking contexts.