Which technology is used to connect multiple devices wirelessly in a network?

Wi-Fi is the technology specifically designed to connect multiple devices wirelessly within a network. It operates within the IEEE 802.11 standards and facilitates the transmission of data over radio waves, allowing devices such as computers, smartphones, tablets, and smart appliances to communicate without the need for wired connections. This wireless connectivity is crucial in modern networking environments, providing flexibility and convenience for users.

Ethernet, on the other hand, is a wired networking technology that connects devices within a local area network (LAN) using cables, which does not meet the wireless criteria of the question. PSTN, or Public Switched Telephone Network, is primarily utilized for traditional voice communication over telephone lines rather than data networking. Fiber optics refers to a type of cable that transmits data using light signals and is typically used for high-speed wired connections, making it unsuitable for wireless device connectivity. Thus, Wi-Fi is the clear choice for wireless networking among the options provided.