Theodore Maiman built the first working laser (Light Amplification by Stimulated Emission of Radiation) at Hughes Research Laboratories, using a synthetic ruby crystal to produce a concentrated beam of coherent light. While initially described as 'a solution looking for a problem,' the laser quickly became one of the most versatile inventions in history. It works by exciting atoms to emit photons of the exact same wavelength and phase. Today, lasers are used in a vast array of applications: from scanning barcodes and playing DVDs to performing precise eye surgeries and cutting steel in manufacturing. They are also the primary tool for high-speed fiber-optic communication. The invention proved that light could be manipulated with extreme precision, opening up new frontiers in physics, medicine, and telecommunications.