Which technology provides wireless high-speed Internet connections using radio waves?

The technology that provides wireless high-speed Internet connections using radio waves is WiFi. WiFi operates under various standards defined by the IEEE 802.11 family and utilizes radio frequency to transmit data between devices such as computers, tablets, and smartphones and a wireless router. This allows devices to connect to the Internet without the need for physical cables, facilitating mobility and convenience for users.

WiFi networks are designed to provide high bandwidth and are widely deployed in homes, businesses, and public spaces, enabling multiple devices to connect simultaneously. The use of radio waves allows for broader coverage areas compared to wired connections, making it a popular choice for accessing the Internet in various environments.

Other options like Bluetooth are primarily designed for short-range communication between devices, while Ethernet refers to wired connections, and fiber optics involves transmitting data through light rather than radio waves. Therefore, WiFi is the correct answer in this context, as it specifically addresses the provision of wireless high-speed Internet connections.