Optical fiber is a thin strand, typically made of highly purified glass or plastic, designed for the transmission of light signals. These fibers operate by channeling light pulses, which represent data, from a point source over significant distances with minimal attenuation. The foundational principle governing its operation is total internal reflection, where the light beam is confined within the core of the fiber because the surrounding cladding material has a lower refractive index. This technology is fundamental to modern telecommunications and various scientific applications, enabling the rapid transfer of large volumes of data by utilizing light waves rather than electrical currents.