What technology is commonly used for high-speed Internet that involves sending signals through light?

Fiber optics is the correct answer because this technology utilizes light to transmit data streams at high speeds over long distances. It works by sending pulses of light through thin strands of glass or plastic fibers, which have a highly efficient capability to carry vast amounts of data with minimal signal loss.

This method of data transmission offers much higher bandwidth compared to traditional technologies, such as coaxial cables or DSL lines, which rely on electrical signals. While coaxial cables and DSL may be sufficient for basic Internet needs, they generally cannot match the speed and reliability provided by fiber optics. Satellite dishes can provide Internet connectivity, but they typically deal with greater latency and are not primarily focused on high-speed data transfer as fiber optics are. Thus, fiber optics stands out as the favored technology for high-speed Internet services, especially in modern applications where speed and quality are paramount.