When light hits a material, it can eject electrons or create electron-hole pairs, forming the basis for sensors and solar cells.

This is the "magic" behind lasers, where an incoming photon triggers an atom to drop to a lower energy state, releasing a second, identical photon.

99% of international data travels through undersea fiber-optic cables using light pulses.

Devices like LEDs (efficient light sources) and Laser Diodes (precise, coherent light).