Laser therapy uses focused beams of light to precisely cut, burn, or destroy tissue for medical purposes. Common applications include removing tumors, sealing blood vessels to prevent bleeding, and performing eye surgeries like cataract removal and refractive procedures to correct vision. The document discusses the history and types of lasers and laser eye surgeries, including LASIK, PRK, and LASEK procedures used to treat conditions like nearsightedness, farsightedness, and astigmatism.